wifi: mwifiex: fix double free in mwifiex_send_rgpower_table()

The "hostcmd" is freed using cleanup.h, so calling kfree() will lead to
a double free.  Delete the kfree().

Fixes: 7b6f16a2 ("wifi: mwifiex: add rgpower table loading support")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Francesco Dolcini <francesco.dolcini@toradex.com>
Link: https://patch.msgid.link/aLqZBh5_dSHUb4AE@stanley.mountain


Signed-off-by: Johannes Berg <johannes.berg@intel.com>