staging: gma500: fix some swapped gotos

These gotos were swapped.  In the original code, the first would result
in a NULL dereference and the second would result in a memory leak.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>