Fix Coverity Scan CID 60348 (Variable addr going out of scope leaks the storage it points to.)

openair3/SCTP/sctp_eNB_task.c

@@ -832,6 +832,11 @@ err:
         sctp_cnx = NULL;
     }
 
+    if (addr != NULL) {
+        free(addr);
+        addr = NULL;
+    }
+
     return -1;
 }