ip: fix memory leak in ipmaddr.c

If the continue is taken, then there is a memory leak.

https://bugzilla.novell.com/show_bug.cgi?id=538996

Reported-by: David Binderman <dcb314@hotmail.com>
Signed-off-by: Brandon Philips <bphilips@suse.de>

ip/ipmaddr.c

@@ -136,7 +136,7 @@ void read_igmp(struct ma_info **result_p)
 	m.addr.bytelen = 4;
 
 	while (fgets(buf, sizeof(buf), fp)) {
-		struct ma_info *ma = malloc(sizeof(m));
+		struct ma_info *ma;
 
 		if (buf[0] != '\t') {
 			sscanf(buf, "%d%s", &m.index, m.name);