staging: rtl8192u: remove unnecessary return in r8190_rtl8256.c

remove the unnecessary return at the end of function
phy_set_rf8256_ofdm_tx_power(), reported by scripts/checkpatch.pl.

Signed-off-by: Du Cheng <ducheng2@gmail.com>
Link: https://lore.kernel.org/r/20210219150527.8358-2-ducheng2@gmail.com


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