Crash generated in client while running sanity on distributed-stripe volume on a release-3.2 branch.

Crash happens because local is NULL & no check is present. 

Core was generated by `glusterfs --volfile-server=centos-qa-sanity --volfile-id=vol /export/nightly/mo'.
Program terminated with signal 11, Segmentation fault.
#0  0x00002aaaab1ad8cc in client3_1_mkdir_cbk (req=0x2aaaaccf1710, iov=0x2aaaaccf1750, count=1, myframe=0x2ab8f9216058)
    at ../../../../../xlators/protocol/client/src/client3_1-fops.c:264
264             inode = local->loc.inode;
(gdb) bt
#0  0x00002aaaab1ad8cc in client3_1_mkdir_cbk (req=0x2aaaaccf1710, iov=0x2aaaaccf1750, count=1, myframe=0x2ab8f9216058)
    at ../../../../../xlators/protocol/client/src/client3_1-fops.c:264
#1  0x00002ab8f857396c in rpc_clnt_handle_reply (clnt=0x8827fb0, pollin=0x2aaab002d100) at ../../../../rpc/rpc-lib/src/rpc-clnt.c:741
#2  0x00002ab8f8573ca3 in rpc_clnt_notify (trans=0x8828160, mydata=0x8827fe0, event=RPC_TRANSPORT_MSG_RECEIVED, data=0x2aaab002d100)
    at ../../../../rpc/rpc-lib/src/rpc-clnt.c:854
#3  0x00002ab8f857037a in rpc_transport_notify (this=0x8828160, event=RPC_TRANSPORT_MSG_RECEIVED, data=0x2aaab002d100)
    at ../../../../rpc/rpc-lib/src/rpc-transport.c:919
#4  0x00002aaaaad6d7ed in socket_event_poll_in (this=0x8828160) at ../../../../../rpc/rpc-transport/socket/src/socket.c:1647
#5  0x00002aaaaad6dd2f in socket_event_handler (fd=11, idx=2, data=0x8828160, poll_in=1, poll_out=0, poll_err=0)
    at ../../../../../rpc/rpc-transport/socket/src/socket.c:1762
#6  0x00002ab8f832aef0 in event_dispatch_epoll_handler (event_pool=0x8803210, events=0x8807d40, i=0)
    at ../../../libglusterfs/src/event.c:794
#7  0x00002ab8f832b0f5 in event_dispatch_epoll (event_pool=0x8803210) at ../../../libglusterfs/src/event.c:856
#8  0x00002ab8f832b44f in event_dispatch (event_pool=0x8803210) at ../../../libglusterfs/src/event.c:956
#9  0x0000000000406e2a in main (argc=4, argv=0x7fff39e6fb38) at ../../../glusterfsd/src/glusterfsd.c:1509
(gdb) l
259
260             frame = myframe;
261
262             local = frame->local;
263             frame->local = NULL;
264             inode = local->loc.inode;
265
266             if (-1 == req->rpc_status) {
267                     rsp.op_ret   = -1;
268                     rsp.op_errno = ENOTCONN;
(gdb) p frame
$1 = (call_frame_t *) 0x2ab8f9216058
(gdb) p local
$2 = (clnt_local_t *) 0x0
(gdb) p frame->local
$3 = (void *) 0x0
(gdb) p local->loc.inode
Cannot access memory at address 0x10
(gdb) p inode
$4 = (inode_t *) 0x0
(gdb) p local
$5 = (clnt_local_t *) 0x0