staging: rtl8188eu: replace if else with ternary operator

Replace if else with a single call and ternary operator to
slightly reduce object file size. Also clears a checkpatch
warning: WARNING: Statements should start on a tabstop

Suggested-by: Joe Perches <joe@perches.com>
Signed-off-by: Michael Straube <straube.linux@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>