video: fbdev: sis: use swap() to make code cleaner

Use the macro 'swap()' defined in 'include/linux/minmax.h' to avoid
opencoding it.
Reported-by: Zeal Robot <zealci@zte.com.cn>
Signed-off-by: David Yang <davidcomponentone@gmail.com>
Signed-off-by: Yang Guang <yang.guang5@zte.com.cn>
Signed-off-by: Helge Deller <deller@gmx.de>

drivers/video/fbdev/sis/sis_main.c

@@ -213,7 +213,7 @@ static void sisfb_search_mode(char *name, bool quiet)
 		/* This does some fuzzy mode naming detection */
 		if(sscanf(strbuf1, "%u %u %u %u", &xres, &yres, &depth, &rate) == 4) {
 			if((rate <= 32) || (depth > 32)) {
-				j = rate; rate = depth; depth = j;
+				swap(rate, depth);
 			}
 			sprintf(strbuf, "%ux%ux%u", xres, yres, depth);
 			nameptr = strbuf;