CMSG_FIRSTHDR could theoretically return NULL. Check it for the
peace of mind.
CMSG_FIRSTHDR() returns a pointer to the first cmsghdr in the
ancillary data buffer associated with the passed msghdr.
It returns NULL if there isn't enough space for a cmsghdr
in the buffer.
Change-Id: I6c7e1eb59121b59c568d3ad7f5eda649a49026f4
Signed-off-by: Darek Stojaczyk <dariusz.stojaczyk@intel.com>
Reviewed-on: https://review.spdk.io/gerrit/c/spdk/spdk/+/771
Reviewed-by: Paul Luse <paul.e.luse@intel.com>
Reviewed-by: Shuhei Matsumoto <shuhei.matsumoto.xt@hitachi.com>
Reviewed-by: Tomasz Zawadzki <tomasz.zawadzki@intel.com>
Tested-by: SPDK CI Jenkins <sys_sgci@intel.com>
8c37b10702