[OpenMP] Fix build of stubs library, NFC.

Both Clang and GCC complained that they cannot initialize a return
object of type 'kmp_proc_bind_t' with an 'int'. While at it, also
fix a warning about missing parentheses thrown by Clang.

Differential Revision: https://reviews.llvm.org/D65284

git-svn-id: https://llvm.org/svn/llvm-project/openmp/trunk@367041 91177308-0d34-0410-b5e6-96231b3b80d8
1 file changed