mem-prealloc: fix sysconf(_SC_NPROCESSORS_ONLN) failure case.

mem-prealloc: fix sysconf(_SC_NPROCESSORS_ONLN) failure case.

This was spotted by Coverity, in case where sysconf(_SC_NPROCESSORS_ONLN)
fails and returns -1. This results in memset_num_threads getting set to -1.
Which we then pass to g_new0().
The patch replaces MAX_MEM_PREALLOC_THREAD_COUNT macro with a function call
get_memset_num_threads() to handle sysconf() failure gracefully. In case
sysconf() fails, we fall back to single threaded.

(Spotted by Coverity, CID 1372465.)

Signed-off-by: Jitendra Kolhe <[email protected]>
Message-Id: <1490079006[email protected]>
Signed-off-by: Paolo Bonzini <[email protected]>