minor symfony#14567 [Filesystem] Simplify if statement (kix)

This PR was submitted for the master branch but it was merged into the 2.3 branch instead (closes symfony#14567).

Discussion
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[Filesystem] Simplify if statement

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | none
| License       | MIT
| Doc PR        | none

Simplified the `if` statement if `Symfony\Component\Filesystem\Filesystem::isAbsolutePath`

Commits
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4d974ce [Filesystem] Simplified an if statement

Author: fabpot

src/Symfony/Component/Filesystem/Filesystem.php

@@ -423,17 +423,13 @@ public function mirror($originDir, $targetDir, \Traversable $iterator = null, $o
      */
     public function isAbsolutePath($file)
     {
-        if (strspn($file, '/\\', 0, 1)
+        return (strspn($file, '/\\', 0, 1)
             || (strlen($file) > 3 && ctype_alpha($file[0])
                 && substr($file, 1, 1) === ':'
                 && (strspn($file, '/\\', 2, 1))
             )
             || null !== parse_url($file, PHP_URL_SCHEME)
-        ) {
-            return true;
-        }
-
-        return false;
+        );
     }
 
     /**