[test] Fix uninitialized memory in omp_taskloop_grainsize.c
[test] Fix uninitialized memory in omp_taskloop_grainsize.c

result was never initialized to zero which sometimes failed the test.

git-svn-id: f99161ee8ccfe2101cbe1bdda2220bce2ed25485@314513 91177308-0d34-0410-b5e6-96231b3b80d8

llvm-mirror/openmp,llvm-mirror/openmp,llvm-mirror/openmp,llvm-mirror/openmp,llvm-mirror/openmp