fix memory leaks about packets

src/libgit2/transports/smart_pkt.c

@@ -694,6 +694,8 @@ int git_pkt_buffer_wants(
 		git_str_printf(&deepen_buf, "deepen %d\n", wants->depth);
 		git_str_printf(buf,"%04x%s", (unsigned int)git_str_len(&deepen_buf) + 4, git_str_cstr(&deepen_buf));
 
+		git_str_dispose(&deepen_buf);
+		
 		if (git_str_oom(buf))
 			return -1;
 	}

src/libgit2/transports/smart_protocol.c

@@ -385,8 +385,12 @@ int git_smart__negotiate_fetch(git_transport *transport, git_repository *repo, c
 				git_error_set(GIT_ERROR_NET, "Unexpected pkt type");
 				goto on_error;
 			}
+
+			git_pkt_free((git_pkt *) pkt);
 		}
 
+		git_pkt_free((git_pkt *) pkt);
+
 		if (error < 0) {
 			goto on_error;
 		}