amt: remove unnecessary (void*) conversions

Remove unnecessary void* type castings.
Signed-off-by: Yu Zhe <yuzhe@nfschina.com>
Acked-by: Taehee Yoo <ap420073@gmail.com>
Link: https://lore.kernel.org/r/20220621021648.2544-1-yuzhe@nfschina.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

drivers/net/amt.c

@@ -1373,11 +1373,11 @@ static void amt_add_srcs(struct amt_dev *amt, struct amt_tunnel_list *tunnel,
 	int i;
 
 	if (!v6) {
-		igmp_grec = (struct igmpv3_grec *)grec;
+		igmp_grec = grec;
 		nsrcs = ntohs(igmp_grec->grec_nsrcs);
 	} else {
 #if IS_ENABLED(CONFIG_IPV6)
-		mld_grec = (struct mld2_grec *)grec;
+		mld_grec = grec;
 		nsrcs = ntohs(mld_grec->grec_nsrcs);
 #else
 	return;
@@ -1458,11 +1458,11 @@ static void amt_lookup_act_srcs(struct amt_tunnel_list *tunnel,
 	int i, j;
 
 	if (!v6) {
-		igmp_grec = (struct igmpv3_grec *)grec;
+		igmp_grec = grec;
 		nsrcs = ntohs(igmp_grec->grec_nsrcs);
 	} else {
 #if IS_ENABLED(CONFIG_IPV6)
-		mld_grec = (struct mld2_grec *)grec;
+		mld_grec = grec;
 		nsrcs = ntohs(mld_grec->grec_nsrcs);
 #else
 	return;