Generic/EmptyPHPStatement: remove unreachable condition

`$prevNonEmpty` will never be `false` as there will always be at least
a PHP open tag token before the semicolon token.

Author: rodrigoprimo

src/Standards/Generic/Sniffs/CodeAnalysis/EmptyPHPStatementSniff.php

@@ -53,10 +53,6 @@ public function process(File $phpcsFile, $stackPtr)
         case 'T_SEMICOLON':
             $prevNonEmpty = $phpcsFile->findPrevious(Tokens::$emptyTokens, ($stackPtr - 1), null, true);
 
-            if ($prevNonEmpty === false) {
-                return;
-            }
-
             if ($tokens[$prevNonEmpty]['code'] !== T_SEMICOLON
                 && $tokens[$prevNonEmpty]['code'] !== T_OPEN_TAG
                 && $tokens[$prevNonEmpty]['code'] !== T_OPEN_TAG_WITH_ECHO