staging: rtl8192u: fix checkpatch braces warning

fix some code style related to the use of braces in a one statement block

Signed-off-by: Rui Miguel Silva <rmfrfs@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --cc drivers/staging/rtl8192u/r8192U_dm.c
Simple merge

diff --cc drivers/staging/rtl8192u/r8192U_wx.c
Simple merge

diff --cc drivers/staging/rtl8192u/r819xU_firmware.c
Simple merge

diff --cc drivers/staging/rtl8192u/r819xU_phy.c
Simple merge