pxa168fb: trivial typo fix

A missing space in an error message.
Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Cc: Jiri Kosina <trivial@kernel.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

drivers/video/fbdev/pxa168fb.c

@@ -279,7 +279,7 @@ static void set_clock_divider(struct pxa168fb_info *fbi,
 
 	/* check whether divisor is too small. */
 	if (divider_int < 2) {
-		dev_warn(fbi->dev, "Warning: clock source is too slow."
+		dev_warn(fbi->dev, "Warning: clock source is too slow. "
 				"Try smaller resolution\n");
 		divider_int = 2;
 	}