staging: r8188eu: clean up spacing style issues in core/rtw_ieee80211.c

staging: r8188eu: clean up spacing style issues in core/rtw_ieee80211.c

Clean up spacing style issues in core/rtw_ieee80211.c reported by
checkpatch.

CHECK: spaces preferred around that ...
CHECK: No space is necessary after a cast
WARNING: space prohibited between function name and open parenthesis '('

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20210816155818.24005-7-straube.linux@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>