Style tweak to the more idiomatic 'assert(!bad_state())'.

Patch by Caitlin Sadowski.

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@134938 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Sema/SemaDeclAttr.cpp b/lib/Sema/SemaDeclAttr.cpp
index 3548fa2..61b7b3e 100644
--- a/lib/Sema/SemaDeclAttr.cpp
+++ b/lib/Sema/SemaDeclAttr.cpp
@@ -812,7 +812,7 @@
 }
 
 static void handleNoCommonAttr(Sema &S, Decl *D, const AttributeList &Attr) {
-  assert(Attr.isInvalid() == false);
+  assert(!Attr.isInvalid());
   if (isa<VarDecl>(D))
     D->addAttr(::new (S.Context) NoCommonAttr(Attr.getLoc(), S.Context));
   else
@@ -821,7 +821,7 @@
 }
 
 static void handleCommonAttr(Sema &S, Decl *D, const AttributeList &Attr) {
-  assert(Attr.isInvalid() == false);
+  assert(!Attr.isInvalid());
   if (isa<VarDecl>(D))
     D->addAttr(::new (S.Context) CommonAttr(Attr.getLoc(), S.Context));
   else
@@ -2492,7 +2492,7 @@
 }
 
 static void handleOpenCLKernelAttr(Sema &S, Decl *D, const AttributeList &Attr){
-  assert(Attr.isInvalid() == false);
+  assert(!Attr.isInvalid());
   D->addAttr(::new (S.Context) OpenCLKernelAttr(Attr.getLoc(), S.Context));
 }