gprs_ns2: sns: fix del bind()

When the bind to be removed is not the last entry, it would
remove the wrong SNS bind resulting in use-after-free memory.

Change-Id: I79062d404ebba9d5c8f7f209bebde146fa08c71f
diff --git a/src/gb/gprs_ns2_sns.c b/src/gb/gprs_ns2_sns.c
index c6e80af..296a2e7 100644
--- a/src/gb/gprs_ns2_sns.c
+++ b/src/gb/gprs_ns2_sns.c
@@ -1995,6 +1995,7 @@
 		if (tmp->bind == bind) {
 			llist_del(&tmp->list);
 			found = true;
+			break;
 		}
 	}