staging: rtl8723au: Fix resource leak
staging: rtl8723au: Fix resource leak

Firmware was not released properly if kmemdup fails.

Addresses-Coverity-Id: 1269118
Signed-off-by: Mateusz Kulikowski <9d63947b0d9341537b72491be8062d0cafcabb3f@gmail.com>
Acked-by: Jes Sorensen <0e1e349bdba396f044a06b01fef702e072aa66d3@redhat.com>
Signed-off-by: Greg Kroah-Hartman <4645f7897fd33786a2ee1264d590b3c400559d85@linuxfoundation.org>

KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs,KristFoundation/Programs