net: fddi: use swap() to make code cleaner

Use the macro 'swap()' defined in 'include/linux/minmax.h' to avoid
opencoding it.
Signed-off-by: Yihao Han <hanyihao@vivo.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

drivers/net/fddi/skfp/smt.c

@@ -1846,10 +1846,10 @@ void smt_swap_para(struct smt_header *sm, int len, int direction)
 	}
 }
 
+
 static void smt_string_swap(char *data, const char *format, int len)
 {
 	const char	*open_paren = NULL ;
-	int	x ;
 
 	while (len > 0  && *format) {
 		switch (*format) {
@@ -1876,19 +1876,13 @@ static void smt_string_swap(char *data, const char *format, int len)
 			len-- ;
 			break ;
 		case 's' :
-			x = data[0] ;
-			data[0] = data[1] ;
-			data[1] = x ;
+			swap(data[0], data[1]) ;
 			data += 2 ;
 			len -= 2 ;
 			break ;
 		case 'l' :
-			x = data[0] ;
-			data[0] = data[3] ;
-			data[3] = x ;
-			x = data[1] ;
-			data[1] = data[2] ;
-			data[2] = x ;
+			swap(data[0], data[3]) ;
+			swap(data[1], data[2]) ;
 			data += 4 ;
 			len -= 4 ;
 			break ;