staging: r8188eu: remove unnecessary braces in conditional statements

Conform to Linux kernel coding style.

Reported by checkpatch:

WARNING: braces {} are not necessary for single statement blocks
WARNING: braces {} are not necessary for any arm of this statement

Signed-off-by: Rebecca Mckeever <remckee0@gmail.com>
Link: https://lore.kernel.org/r/2b46501bb3965a8cf27e7134407c50551c36b7e8.1648888462.git.remckee0@gmail.com


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