[Sanitizers] Rename CallocShouldReturnNullDueToOverflow to CheckForCallocOverflow

Summary:
Due to changes in semantics, CheckForCallocOverflow makes much more sense
now.

Reviewers: eugenis

Subscribers: llvm-commits, kubamracek

Differential Revision: https://reviews.llvm.org/D34799

llvm-svn: 306747

compiler-rt/lib/lsan/lsan_allocator.cc

@@ -135,7 +135,7 @@ void *lsan_realloc(void *p, uptr size, const StackTrace &stack) {
 
 void *lsan_calloc(uptr nmemb, uptr size, const StackTrace &stack) {
   size *= nmemb;
-  return Allocate(stack, size, 1, true);
+  return Allocate(stack, size, 1, true /**/);
 }
 
 void *lsan_valloc(uptr size, const StackTrace &stack) {