net/ipv4/igmp.c: Remove unnecessary kmalloc casts

Signed-off-by: NJoe Perches <joe@perches.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

net/ipv4/igmp.c

@@ -1646,8 +1646,7 @@ static int sf_setstate(struct ip_mc_list *pmc)
 				if (dpsf->sf_inaddr == psf->sf_inaddr)
 					break;
 			if (!dpsf) {
-				dpsf = (struct ip_sf_list *)
-					kmalloc(sizeof(*dpsf), GFP_ATOMIC);
+				dpsf = kmalloc(sizeof(*dpsf), GFP_ATOMIC);
 				if (!dpsf)
 					continue;
 				*dpsf = *psf;