Staging: rtl8712: remove break after return statement

This patch fixes checkpatch.pl warning in rtl871x_ioctl_linux.c file
WARNING : break is not useful after goto or return

Signed-off-by: Tapasweni Pathak <tapaswenipathak@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>