staging:gdm72xx: Fix unnecessary brace errors

This patch fixes the following warning for gdm_wimax.c
WARNING: braces {} are not necessary for any arm of this statement

Signed-off-by: Himangi Saraogi <himangi774@gmail.com>
Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>