igmpproxy: allow 0.0.0.0/0 as allowed net in the config

Signed-off-by: Felix Fietkau <nbd@openwrt.org>

git-svn-id: svn://svn.openwrt.org/openwrt/packages@40729 3c298f89-4303-0410-b956-a3cf2f4a3e73

net/igmpproxy/patches/200-allow_wildcard_addr.patch

@@ -0,0 +1,24 @@
+--- a/src/config.c
++++ b/src/config.c
+@@ -357,15 +357,18 @@ struct SubnetList *parseSubnetAddress(ch
+     tmpStr = strtok(NULL, "/");
+     if(tmpStr != NULL) {
+         int bitcnt = atoi(tmpStr);
+-        if(bitcnt <= 0 || bitcnt > 32) {
++        if(bitcnt < 0 || bitcnt > 32) {
+             my_log(LOG_WARNING, 0, "The bits part of the address is invalid : %d.",tmpStr);
+             return NULL;
+         }
+ 
+-        mask <<= (32 - bitcnt);
++		if (bitcnt == 0)
++			mask = 0;
++		else
++	        mask <<= (32 - bitcnt);
+     }
+ 
+-    if(addr == -1 || addr == 0) {
++    if(addr == -1) {
+         my_log(LOG_WARNING, 0, "Unable to parse address token '%s'.", addrstr);
+         return NULL;
+     }