qemu-sockets: avoid strlen of NULL pointer
If the user wants to create a chardev of type socket but forgets to give a host= option, qemu_opt_get returns NULL. This NULL pointer is then fed into strlen a few lines below without a check which results in a segfault. This fixes it. Signed-off-by: NJens Osterkamp <jens@linux.vnet.ibm.com> Signed-off-by: NAurelien Jarno <aurelien@aurel32.net>
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