Clean up code format and error message

src/Composer/Downloader/ZipDownloader.php

@@ -45,10 +45,8 @@ class ZipDownloader extends ArchiveDownloader
                 }
 
                 $processError = 'Failed to execute ' . $command . "\n\n" . $this->process->getErrorOutput();
-            }
+            } catch(\Exception $e) {
-            catch(\Exception $e)
+                $processError = 'Failed to execute ' . $command . "\n\n" . $e->getMessage();
-            {
-                $processError = $e->getMessage();
             }
         }