staging: rtl8192u: Delete 'fwSendNullPacket' function in r819xU_firmware.c
staging: rtl8192u: Delete 'fwSendNullPacket' function in r819xU_firmware.c

Delete the fwSendNullPacket function that is not used in anywhere in
the driver.

Fix sparse warnings:
drivers/staging/rtl8192u/r819xU_firmware.c:109:1: warning: symbol 'fwSendNullPacket' was not declared. Should it be static?

Signed-off-by: Ana Rey <f8e8e2faffc65f8cee6706477d554bda98df43c6@gmail.com>
Signed-off-by: Greg Kroah-Hartman <4645f7897fd33786a2ee1264d590b3c400559d85@linuxfoundation.org>

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