[TableGen] Remove unnecessary default constructed SMLoc that just existed to return. Instead just call the default constructor in the return.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@239277 91177308-0d34-0410-b5e6-96231b3b80d8

utils/TableGen/CTagsEmitter.cpp

@@ -59,11 +59,7 @@ private:
 
 SMLoc CTagsEmitter::locate(const Record *R) {
   ArrayRef<SMLoc> Locs = R->getLoc();
-  if (Locs.empty()) {
-    SMLoc NullLoc;
-    return NullLoc;
-  }
-  return Locs.front();
+  return !Locs.empty() ? Locs.front() : SMLoc();
 }
 
 void CTagsEmitter::run(raw_ostream &OS) {