staging: rtl8192e: Cleanup checkpatch -f warnings and errors - Part XVI

This patch removes all the errors and most of the warnings generated by
checkpatch -f for rtllib_softmac_tx.c..
Signed-off-by: NLarry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: NGreg Kroah-Hartman <gregkh@suse.de>