Add braces to silence -Wdangling-else; NFC

Author: AaronBallman

clang/lib/Sema/SemaChecking.cpp

@@ -12473,7 +12473,7 @@ static void AnalyzeImplicitConversions(
           << OrigE->getSourceRange() << T->isBooleanType()
           << FixItHint::CreateReplacement(UO->getBeginLoc(), "!");
 
-  if (auto *BO = dyn_cast<BinaryOperator>(SourceExpr))
+  if (auto *BO = dyn_cast<BinaryOperator>(SourceExpr)) {
     if ((BO->getOpcode() == BO_And || BO->getOpcode() == BO_Or) &&
         BO->getLHS()->isKnownToHaveBooleanValue() &&
         BO->getRHS()->isKnownToHaveBooleanValue() &&
@@ -12513,6 +12513,7 @@ static void AnalyzeImplicitConversions(
                         /*ExtraCheckForImplicitConversion=*/true);
       return;
     }
+  }
 
   // For conditional operators, we analyze the arguments as if they
   // were being fed directly into the output.