[InstCombine] Fix the signature of fgets_unlocked.

It returns a pointer, not an int. This miscompiles all code that uses
the return value of fgets.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@332531 91177308-0d34-0410-b5e6-96231b3b80d8
2 files changed