Tweak upgrade command.

Mage/Command/BuiltIn/UpgradeCommand.php

@@ -80,7 +80,6 @@ class UpgradeCommand extends InstallCommand
         				file_put_contents($tarballFile, $tarball);
 
         				Console::executeCommand('rm -rf ' . MAGALLANES_DIRECTORY);
-        				Console::executeCommand('mkdir -p ' . MAGALLANES_DIRECTORY);
         				Console::executeCommand('cd ' . dirname($tarballFile) . ' && tar xfz ' . $tarballFile);
         				Console::executeCommand('mv ' . dirname($tarballFile) . '/magallanes ' . MAGALLANES_DIRECTORY);