Staging: rtl8192e: Fix Sparse Warning of invalid assignment in rtllib_tx.c
This patch fixes following sparse warnings:
drivers/staging/rtl8192e/rtllib_tx.c:942:45: warning: invalid assignment: +=
drivers/staging/rtl8192e/rtllib_tx.c:942:45: left side has type unsigned long
drivers/staging/rtl8192e/rtllib_tx.c:942:45: right side has type restricted __le16
drivers/staging/rtl8192e/rtllib_tx.c:947:49: warning: invalid assignment: +=
drivers/staging/rtl8192e/rtllib_tx.c:947:49: left side has type unsigned long
drivers/staging/rtl8192e/rtllib_tx.c:947:49: right side has type restricted __le16