Description of problem:
As in qemu-kvm man page says, "n" is optional,

   "-smp [[cpus=]n][,maxcpus=maxcpus][,sockets=sockets][,dies=dies][,cores=cores][,threads=threads]"

However, if launch qemu with '-smp ,maxcpus=4', qemu core dumped.


Version-Release number of selected component (if applicable):
qemu-kvm-6.1.0-1.rc1.scrmod+el8.5.0+12016+049b55fd.wrb210728
kernel-4.18.0-323.el8.x86_64

How reproducible:
always

Steps to Reproduce:
1. # /usr/libexec/qemu-kvm -smp ,maxcpus=4


Actual results:
qemu-kvm: ../qobject/qdict.c:369: qentry_destroy: Assertion `e->value != NULL' failed.
Aborted (core dumped)

Expected results:
QEMU quit with error message instead of core dump.

Additional info:
1. It's a regression.  qemu-kvm-6.0.0-16.module+el8.5.0+10848+2dccc46d works well.

2. "/usr/libexec/qemu-kvm -smp maxcpus=4,sockets=2,cores=2" works well.

3. (gdb) bt full
#0  __GI_raise (sig=sig@entry=6) at ../sysdeps/unix/sysv/linux/raise.c:50
        set = {__val = {0, 93825009086592, 0, 140737298297931, 93827783032832, 93825009086592, 
            93825009086592, 93825009086592, 93825009086592, 93825009086679, 93825009086692, 
            93825009086592, 93825009086692, 0, 0, 0}}
        pid = <optimized out>
        tid = <optimized out>
        ret = <optimized out>
#1  0x00007ffff4a67db5 in __GI_abort () at abort.c:79
        save_stage = 1
        act = {__sigaction_handler = {sa_handler = 0x555556567080, sa_sigaction = 0x555556567080}, 
          sa_mask = {__val = {0, 140737301732288, 140737299375648, 0, 0, 0, 140737488343752, 
              21474836480, 140737488343600, 140737299432112, 140737299416728, 0, 14713352540630688768, 
              140737299401645, 0, 140737299416728}}, sa_flags = 1442461189, 
          sa_restorer = 0x555555fa3627}
        sigs = {__val = {32, 0 <repeats 15 times>}}
#2  0x00007ffff4a67c89 in __assert_fail_base (
    fmt=0x7ffff4bd0698 "%s%s%s:%u: %s%sAssertion `%s' failed.\n%n", 
--Type <RET> for more, q to quit, c to continue without paging--
    assertion=0x555555fa3627 "e->value != NULL", file=0x555555fa3605 "../qobject/qdict.c", line=369, 
    function=<optimized out>) at assert.c:92
        str = 0x555556567080 ""
        total = 4096
#3  0x00007ffff4a75a76 in __GI___assert_fail (
    assertion=assertion@entry=0x555555fa3627 "e->value != NULL", 
    file=file@entry=0x555555fa3605 "../qobject/qdict.c", line=line@entry=369, 
    function=function@entry=0x555555fa3668 <__PRETTY_FUNCTION__.16005> "qentry_destroy") at assert.c:101
No locals.
#4  0x0000555555c3a736 in qentry_destroy (e=0x5555565670f0) at ../qobject/qdict.c:369
        __PRETTY_FUNCTION__ = "qentry_destroy"
        _obj = <optimized out>
        __mptr = <optimized out>
#5  qentry_destroy (e=0x5555565670f0) at ../qobject/qdict.c:365
        __PRETTY_FUNCTION__ = "qentry_destroy"
#6  0x0000555555c3b056 in qdict_destroy_obj (obj=<optimized out>) at ../qobject/qdict.c:438
        tmp = 0x0
--Type <RET> for more, q to quit, c to continue without paging--c
        entry = <optimized out>
        i = <optimized out>
        qdict = <optimized out>
        __PRETTY_FUNCTION__ = "qdict_destroy_obj"
#7  0x0000555555b11790 in qobject_unref_impl (obj=0x555556566020) at /usr/src/debug/qemu-kvm-6.1.0-1.rc1.scrmod+el8.5.0+12016+049b55fd.wrb210728.x86_64/include/qapi/qmp/qobject.h:93
        __PRETTY_FUNCTION__ = "qobject_unref_impl"
#8  machine_parse_property_opt (propname=0x555555cba45e "smp", errp=0x7fffffffd410, arg=<optimized out>, opts_list=<optimized out>) at ../softmmu/vl.c:1562
        opts = 0x555556566020
        prop = 0x0
        help = false
        _auto_errp_prop = {local_err = 0x555556567040, errp = 0x5555564e5070 <error_fatal>}
        opts = <optimized out>
        prop = <optimized out>
        help = <optimized out>
        _auto_errp_prop = <optimized out>
        _obj = <optimized out>
        __mptr = <optimized out>
        _obj = <optimized out>
        __mptr = <optimized out>
#9  qemu_init (argc=3, argv=0x7fffffffd628, envp=<optimized out>) at ../softmmu/vl.c:3341
        popt = <optimized out>
        opts = <optimized out>
        icount_opts = 0x0
        accel_opts = <optimized out>
        olist = <optimized out>
        optind = 3
        optarg = 0x7fffffffd9b5 ",maxcpus=4"
        machine_class = <optimized out>
        userconfig = <optimized out>
        vmstate_dump_file = 0x0
        __func__ = "qemu_init"
#10 0x000055555588cced in main (argc=<optimized out>, argv=<optimized out>, envp=<optimized out>) at ../softmmu/main.c:49
No locals.