lib/bch:using swap() instead of tmp variable

swap() was used instead of the tmp variable to swap values

Signed-off-by: Yihao Han <hanyihao@vivo.com>

lib/bch.c

@@ -500,7 +500,7 @@ static int solve_linear_system(struct bch_control *bch, unsigned int *rows,
 			       unsigned int *sol, int nsol)
 {
 	const int m = GF_M(bch);
-	unsigned int tmp, mask;
+	unsigned int mask;
 	int rem, c, r, p, k, param[BCH_MAX_M];
 
 	k = 0;
@@ -514,9 +514,7 @@ static int solve_linear_system(struct bch_control *bch, unsigned int *rows,
 		for (r = p; r < m; r++) {
 			if (rows[r] & mask) {
 				if (r != p) {
-					tmp = rows[r];
-					rows[r] = rows[p];
-					rows[p] = tmp;
+					swap(rows[r], rows[p]);
 				}
 				rem = r+1;
 				break;
@@ -833,21 +831,15 @@ static void gf_poly_div(struct bch_control *bch, struct gf_poly *a,
 static struct gf_poly *gf_poly_gcd(struct bch_control *bch, struct gf_poly *a,
 				   struct gf_poly *b)
 {
-	struct gf_poly *tmp;
-
 	dbg("gcd(%s,%s)=", gf_poly_str(a), gf_poly_str(b));
 
 	if (a->deg < b->deg) {
-		tmp = b;
-		b = a;
-		a = tmp;
+		swap(b, a);
 	}
 
 	while (b->deg > 0) {
 		gf_poly_mod(bch, a, b, NULL);
-		tmp = b;
-		b = a;
-		a = tmp;
+		swap(b, a);
 	}
 
 	dbg("%s\n", gf_poly_str(a));