viafb: fix sparse warnings

Fix this sparse warnings:

  drivers/video/via/viafbdev.c:871:3: warning: returning void-valued expression
  drivers/video/via/viafbdev.c:938:3: warning: returning void-valued expression
  drivers/video/via/viafbdev.c:995:3: warning: returning void-valued expression
Signed-off-by: Hannes Eder <hannes@hanneseder.net>
Cc: Krzysztof Helt <krzysztof.h1@poczta.fm>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/video/via/viafbdev.c

@@ -870,8 +870,10 @@ static void viafb_fillrect(struct fb_info *info,
 	u32 col = 0, rop = 0;
 	int pitch;
 
-	if (!viafb_accel)
-		return cfb_fillrect(info, rect);
+	if (!viafb_accel) {
+		cfb_fillrect(info, rect);
+		return;
+	}
 
 	if (!rect->width || !rect->height)
 		return;
@@ -937,8 +939,10 @@ static void viafb_copyarea(struct fb_info *info,
 
 	DEBUG_MSG(KERN_INFO "viafb_copyarea!!\n");
 
-	if (!viafb_accel)
-		return cfb_copyarea(info, area);
+	if (!viafb_accel) {
+		cfb_copyarea(info, area);
+		return;
+	}
 
 	if (!area->width || !area->height)
 		return;
@@ -994,8 +998,10 @@ static void viafb_imageblit(struct fb_info *info,
 	int i;
 	int pitch;
 
-	if (!viafb_accel)
-		return cfb_imageblit(info, image);
+	if (!viafb_accel) {
+		cfb_imageblit(info, image);
+		return;
+	}
 
 	udata = (u32 *) image->data;