staging: et131x: Use braces on all arms of if/else statements

In some places in et131x.c, one arm of am if/else statement has braces
and the other not - put braces on both arms where this happens.

Signed-off-by: Mark Einon <mark.einon@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>