Generic/InlineControlStructure: remove unreachable if condition

Commit e1b9595 changed the
InlineControlStructure sniff to make it bail early for all control
structures without a body (before the sniff did that only for `while`
and `for`).

Before commit e1b9595, `$nextNonEmpty`
could be `false` as there were some scenarios where there would be no
non-empty tokens after the `$stackPtr` or after the `parenthesis_closer`.
This is the case for the `else` without a body in
InlineControlStructureUnitTest.2.inc and the `if` without a body in
InlineControlStructureUnitTest.5.inc.

After commit e1b9595, `$nextNonEmpty`
cannot be `false` anymore as cases where there are no non-empty tokens
are handled before this variable is set. This happens either in line 83
when `$nextTokenIndex` is set or line 98 when `$nextTokenIndex` is not
set (a control structure that is not `T_ELSE` or `T_DO` and is missing
the parenthesis closer).

Author: rodrigoprimo

src/Standards/Generic/Sniffs/ControlStructures/InlineControlStructureSniff.php

@@ -115,10 +115,6 @@ public function process(File $phpcsFile, int $stackPtr)
         }
 
         $nextNonEmpty = $phpcsFile->findNext(Tokens::EMPTY_TOKENS, ($start + 1), null, true);
-        if ($nextNonEmpty === false) {
-            // Live coding or parse error.
-            return;
-        }
 
         if ($tokens[$nextNonEmpty]['code'] === T_OPEN_CURLY_BRACKET
             || $tokens[$nextNonEmpty]['code'] === T_COLON