staging: r8188eu: use kmemdup instead of kzalloc and memcpy

Use kmemdup instead of kzalloc and memcpy in load_firmware().

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20220107103620.15648-10-straube.linux@gmail.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>