pimd: Modifying in_addr to PIM_ADDR in igmp_source for IPv6.

Changed struct in_addr source_addr to PIM_ADDR source_addr
in struct igmp_source which is to be used in
both IPv4 and IPv6(Both MLD and IGMP).

Reviewed-by: Sarita Patra <saritap@vmware.com>
Signed-off-by: Mobashshera Rasool <mrasool@vmware.com>

pimd/pim_igmp.h

@@ -141,7 +141,7 @@ int igmp_validate_checksum(char *igmp_msg, int igmp_msg_len);
 #define IGMP_SOURCE_DONT_SEND(flags)       ((flags) &= ~IGMP_SOURCE_MASK_SEND)
 
 struct igmp_source {
-	struct in_addr source_addr;
+	struct PIM_ADDR source_addr;
 	struct thread *t_source_timer;
 	struct igmp_group *source_group; /* back pointer */
 	time_t source_creation;