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Description of problem:
Some spice options when malformed make qemu-kvm exit gracefully, some make it crash with SIGABRT:

/usr/libexec/qemu-kvm -spice port=blabla
    makes qemu-kvm exit gracefully with exit code 1 and error message:
qemu-kvm: -spice port=blabla: Parameter 'port' expects a number
parse error: port=blabla

But,
/usr/libexec/qemu-kvm -spice port=3000,addr=blabla
    makes qemu-kvm crash with code 134 and message:
do_spice_init: starting 0.8.1
reds_init_socket: getaddrinfo(blabla,3000): Name or service not known

Aborted (core dumped)

Version-Release number of selected component (if applicable):
qemu-kvm-0.12.1.2-2.165.el6.x86_64
spice-server-0.8.1-2.el6.x86_64

How reproducible:
100%

Steps to Reproduce:
1. /usr/libexec/qemu-kvm -spice port=3000,addr=blabla
  
Actual results:
exit code: 134
message:
do_spice_init: starting 0.8.1
reds_init_socket: getaddrinfo(blabla,3000): Name or service not known

Aborted (core dumped)

Expected results:
exit code: 1
message:
qemu-kvm: -spice port=3000,addr=blabla: Parameter 'addr' expects a valid address identifier
parse error: addr=blabla

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