The patch fixes memcpy to NULL address when the ucode DMA allocation failure.

This is a fix to bug
http://www.intellinuxwireless.org/bugzilla/show_bug.cgi?id=1861Signed-off-by: NZhu Yi <yi.zhu@intel.com>
Signed-off-by: NReinette Chatre <reinette.chatre@intel.com>
Signed-off-by: NJohn W. Linville <linville@tuxdriver.com>