Staging: rtl8712: Fixed a coding sytle issue

Removed braces for a 'if' condition as it contain only single line &
there is no need for braces for such case according to coding style
rules.

Signed-off-by: Ankit Baluni <b18007@students.iitmandi.ac.in>
Link: https://lore.kernel.org/r/20200729074541.1972-1-b18007@students.iitmandi.ac.in


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