crypto: sa2ul - fix compiler warning produced by clang

Clang detects a warning for an assignment that doesn't really do
anything. Fix this by removing the offending piece of code.

Fixes: 7694b6ca ("crypto: sa2ul - Add crypto driver")
Reported-by: Nathan Chancellor <natechancellor@gmail.com>
Signed-off-by: Tero Kristo <t-kristo@ti.com>
Reviewed-by: Nathan Chancellor <natechancellor@gmail.com>
Tested-by: Nathan Chancellor <natechancellor@gmail.com> # build
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

drivers/crypto/sa2ul.c

@@ -1148,14 +1148,12 @@ static int sa_run(struct sa_req *req)
 			ret = sg_split(req->dst, mapped_dst_nents, 0, 1,
 				       &split_size, &dst, &dst_nents,
 				       gfp_flags);
-			if (ret) {
-				dst_nents = dst_nents;
+			if (ret)
 				dst = req->dst;
-			} else {
+			else
 				rxd->split_dst_sg = dst;
 		}
 	}
-	}
 
 	if (unlikely(src_nents != sg_nents)) {
 		dev_warn_ratelimited(sa_k3_dev, "failed to map tx pkt\n");