[NFC] Add parentheses to avoid -Wparentheses.

llvm-svn: 359968
diff --git a/clang/lib/Parse/ParseDecl.cpp b/clang/lib/Parse/ParseDecl.cpp
index e81e086..f63fd56 100644
--- a/clang/lib/Parse/ParseDecl.cpp
+++ b/clang/lib/Parse/ParseDecl.cpp
@@ -3891,7 +3891,7 @@
       continue;
     }
 
-    assert(!isAlreadyConsumed || RangeEnd != SourceLocation() &&
+    assert((!isAlreadyConsumed || RangeEnd != SourceLocation()) &&
                                      "both or neither of isAlreadyConsumed and "
                                      "RangeEnd needs to be set");
     DS.SetRangeEnd(isAlreadyConsumed ? RangeEnd : Tok.getLocation());