staging: rtl8192u: clean up blank line style issues

Add missing and remove unnecessary blank lines to clear checkpatch
issues.

CHECK: Please use a blank line after function/struct/union/enum declarations
CHECK: Blank lines aren't necessary before a close brace '}'
CHECK: Please don't use multiple blank lines
CHECK: Blank lines aren't necessary after an open brace '{'

Signed-off-by: Michael Straube <straube.linux@gmail.com>
Link: https://lore.kernel.org/r/20200919150823.16923-1-straube.linux@gmail.com


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