backlight: lp855x: remove unnecessary parentheses

Remove unnecessary parentheses in order to fix the following checkpatch
error.

ERROR: return is not a function, parentheses are not required

Signed-off-by: Jingoo Han <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

drivers/video/backlight/lp855x_bl.c

···
 		return false;
 	}
 
-	return (addr >= start && addr <= end);
+	return addr >= start && addr <= end;
 }
 
 static int lp8557_bl_off(struct lp855x *lp)