[clang-format][NFC] Reduce indent

By using if init statement.

Author: HazardyKnusperkeks

clang/lib/Format/TokenAnnotator.cpp

@@ -2093,18 +2093,16 @@ class AnnotatingParser {
           !Current.Next->isOneOf(tok::semi, tok::colon, tok::l_brace,
                                  tok::comma, tok::period, tok::arrow,
                                  tok::coloncolon, tok::kw_noexcept)) {
-        if (FormatToken *AfterParen = Current.MatchingParen->Next) {
-          // Make sure this isn't the return type of an Obj-C block declaration
-          if (AfterParen->isNot(tok::caret)) {
-            if (FormatToken *BeforeParen = Current.MatchingParen->Previous) {
-              if (BeforeParen->is(tok::identifier) &&
-                  BeforeParen->isNot(TT_TypenameMacro) &&
-                  BeforeParen->TokenText == BeforeParen->TokenText.upper() &&
-                  (!BeforeParen->Previous ||
-                   BeforeParen->Previous->ClosesTemplateDeclaration)) {
-                Current.setType(TT_FunctionAnnotationRParen);
-              }
-            }
+        if (FormatToken *AfterParen = Current.MatchingParen->Next;
+            AfterParen && AfterParen->isNot(tok::caret)) {
+          // Make sure this isn't the return type of an Obj-C block declaration.
+          if (FormatToken *BeforeParen = Current.MatchingParen->Previous;
+              BeforeParen && BeforeParen->is(tok::identifier) &&
+              BeforeParen->isNot(TT_TypenameMacro) &&
+              BeforeParen->TokenText == BeforeParen->TokenText.upper() &&
+              (!BeforeParen->Previous ||
+               BeforeParen->Previous->ClosesTemplateDeclaration)) {
+            Current.setType(TT_FunctionAnnotationRParen);
           }
         }
       }