staging: rtl8188eu: remove unneeded semicolon

This patch fixes the following issues detected by coccinelle:

drivers/staging/rtl8188eu/core/rtw_xmit.c:688:75-76: Unneeded semicolon
drivers/staging/rtl8188eu/hal/rtl8188e_hal_init.c:2307:64-65: Unneeded semicolon
drivers/staging/rtl8188eu/hal/rtl8188e_rxdesc.c:89:66-67: Unneeded semicolon

Signed-off-by: Teodora Baluta <teobaluta@gmail.com>
Reviewed-by: Peter P Waskiewicz Jr <peter.p.waskiewicz.jr@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>