Generic/UnusedFunctionParameter: remove unreacheable if condition

At this point in the code, there should always be a non-empty token
after the return statement, even if only the scope closer, and thus the
if condition will never be true.
If there is a syntax error and there is nothing after the return, the
code will never reach this point as in the beginning of the method the
code checks if `$token['scope_opener']` is set and this only happens
when there is also a scope_closer.

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

@@ -174,11 +174,6 @@ public function process(File $phpcsFile, $stackPtr)
                 // A return statement as the first content indicates an interface method.
                 if ($code === T_RETURN) {
                     $firstNonEmptyTokenAfterReturn = $phpcsFile->findNext(Tokens::$emptyTokens, ($next + 1), null, true);
-                    if ($firstNonEmptyTokenAfterReturn === false && $implements !== false) {
-                        return;
-                    }
-
-                    // There is a return.
                     if ($tokens[$firstNonEmptyTokenAfterReturn]['code'] === T_SEMICOLON && $implements !== false) {
                         return;
                     }