[compiler-rt] Apply modernize-use-nullptr fixes in sanitizers

- Trim spaces.
- Use nullptr in place of 0 for pointer variables.
- Use '!p' in place of 'p == 0' for null pointer checks.
- Add blank lines to separate function definitions.
- Add 'extern "C"' or 'namespace foo' comments after the appropriate
  closing brackets

This is a continuation of work from 409b7b82. The focus here is on the
various sanitizers (not sanitizer_common, as before).

Patch by Eugene Zelenko!

Differential Revision: http://reviews.llvm.org/D13225

git-svn-id: https://llvm.org/svn/llvm-project/compiler-rt/trunk@248966 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 4 deletions

diff --git a/lib/msan/msan_allocator.cc b/lib/msan/msan_allocator.cc
index 006d993f0..865a4586b 100644
--- a/lib/msan/msan_allocator.cc
+++ b/lib/msan/msan_allocator.cc
@@ -165,7 +165,7 @@ void MsanDeallocate(StackTrace *stack, void *p) {
 void *MsanCalloc(StackTrace *stack, uptr nmemb, uptr size) {
   if (CallocShouldReturnNullDueToOverflow(size, nmemb))
     return allocator.ReturnNullOrDie();
-  return MsanReallocate(stack, 0, nmemb * size, sizeof(u64), true);
+  return MsanReallocate(stack, nullptr, nmemb * size, sizeof(u64), true);
 }
 
 void *MsanReallocate(StackTrace *stack, void *old_p, uptr new_size,
@@ -174,7 +174,7 @@ void *MsanReallocate(StackTrace *stack, void *old_p, uptr new_size,
     return MsanAllocate(stack, new_size, alignment, zeroise);
   if (!new_size) {
     MsanDeallocate(stack, old_p);
-    return 0;
+    return nullptr;
   }
   Metadata *meta = reinterpret_cast<Metadata*>(allocator.GetMetaData(old_p));
   uptr old_size = meta->requested_size;
@@ -204,14 +204,14 @@ void *MsanReallocate(StackTrace *stack, void *old_p, uptr new_size,
 }
 
 static uptr AllocationSize(const void *p) {
-  if (p == 0) return 0;
+  if (!p) return 0;
   const void *beg = allocator.GetBlockBegin(p);
   if (beg != p) return 0;
   Metadata *b = (Metadata *)allocator.GetMetaData(p);
   return b->requested_size;
 }
 
-}  // namespace __msan
+} // namespace __msan
 
 using namespace __msan;