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 <jg1.han@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/video/backlight/lp855x_bl.c

@@ -125,7 +125,7 @@ static bool lp855x_is_valid_rom_area(struct lp855x *lp, u8 addr)
 		return false;
 	}
 
-	return (addr >= start && addr <= end);
+	return addr >= start && addr <= end;
 }
 
 static int lp8557_bl_off(struct lp855x *lp)