Move instruction to delete corrupted file

src/Composer/Command/SelfUpdateCommand.php

@@ -203,6 +203,7 @@ TAGSPUBKEY
         }
 
         if ($err = $this->setLocalPhar($localFilename, $tempFilename, $backupFile)) {
+            @unlink($tempFilename);
             $io->writeError('<error>The file is corrupted ('.$err->getMessage().').</error>');
             $io->writeError('<error>Please re-run the self-update command to try again.</error>');
 
@@ -312,9 +313,6 @@ TAGSPUBKEY
 
             rename($newFilename, $localFilename);
         } catch (\Exception $e) {
-            if ($backupTarget) {
-                @unlink($newFilename);
-            }
             if (!$e instanceof \UnexpectedValueException && !$e instanceof \PharException) {
                 throw $e;
             }