Fix warning "suggest braces around empty body in an 'if' statement"

The body of an if statement could become empty if the macro body
is NULL and cause the if to apply to the next line instead.

Change-Id: I0bea6a46f29bc2c4dfc6e1fa13dd35b094310294
Signed-off-by: Mike J. Chen <mjchen@google.com>
2 files changed