Remove safeguards deemed unnecessary

Author: fredden

src/Standards/PSR12/Sniffs/Functions/ReturnTypeDeclarationSniff.php

@@ -58,7 +58,7 @@ public function process(File $phpcsFile, int $stackPtr)
 
         $returnType = $methodProperties['return_type_token'];
         if ($methodProperties['nullable_return_type'] === true) {
-            $returnType = $phpcsFile->findPrevious(T_NULLABLE, ($returnType - 1), $tokens[$stackPtr]['parenthesis_closer']);
+            $returnType = $phpcsFile->findPrevious(T_NULLABLE, ($returnType - 1));
         }
 
         $colon = $phpcsFile->findPrevious(T_COLON, $returnType, $tokens[$stackPtr]['parenthesis_closer']);
@@ -92,7 +92,7 @@ public function process(File $phpcsFile, int $stackPtr)
 
         if ($tokens[($colon - 1)]['code'] !== T_CLOSE_PARENTHESIS) {
             $error = 'There must not be a space before the colon in a return type declaration';
-            $prev  = $phpcsFile->findPrevious(T_WHITESPACE, ($colon - 1), $tokens[$stackPtr]['parenthesis_closer'], true);
+            $prev  = $phpcsFile->findPrevious(T_WHITESPACE, ($colon - 1), null, true);
             if ($tokens[$prev]['code'] === T_CLOSE_PARENTHESIS) {
                 $fix = $phpcsFile->addFixableError($error, $colon, 'SpaceBeforeColon');
                 if ($fix === true) {