ipaccess-find: Address a warning by coverity of unitialized memory

Use a memset on the sockaddr_in to make coverity happy.

Fixes: CID 1040705
diff --git a/openbsc/src/ipaccess/ipaccess-find.c b/openbsc/src/ipaccess/ipaccess-find.c
index 3f9bf41..bb9819e 100644
--- a/openbsc/src/ipaccess/ipaccess-find.c
+++ b/openbsc/src/ipaccess/ipaccess-find.c
@@ -47,6 +47,7 @@
 			goto err;
 	}
 
+	memset(&sa, 0, sizeof(sa));
 	sa.sin_family = AF_INET;
 	sa.sin_port = htons(3006);
 	sa.sin_addr.s_addr = INADDR_ANY;