staging: rtl8192e: remove unnecessary braces for single statement blocks

This commit cleans up checkpatch warning as follows:
braces {} are not necessary for single statement blocks

Signed-off-by: Rui Li <me@lirui.org>
Tested-by: Philipp Hortmann <philipp.g.hortmann@gmail.com>
Link: https://lore.kernel.org/r/166558541522.9.15423282339326993462.68459319@lirui.org


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>