staging: r8188eu: convert type of return variable in load_firmware()

The return type of load_firmware() is int. Change the type of the
return variable from s32 to int to match the function return type.

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20220107103620.15648-7-straube.linux@gmail.com


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