rtpengine: fix error output on send_rtpp_command()

* rename out variable to cmd due to We already have an out goto label

src/modules/rtpengine/rtpengine.c

@@ -2770,7 +2770,7 @@ send_rtpp_command(struct rtpp_node *node, bencode_item_t *dict, int *outlen)
 	static char buf[0x10000];
 	struct pollfd fds[1];
 	struct iovec *v;
-	str out = STR_NULL;
+	str cmd = STR_NULL;
 
 	v = bencode_iovec(dict, &vcnt, 1, 0);
 	if (!v) {
@@ -2835,8 +2835,9 @@ send_rtpp_command(struct rtpp_node *node, bencode_item_t *dict, int *outlen)
 				len = writev(rtpp_socks[node->idx], v, vcnt + 1);
 			} while (len == -1 && (errno == EINTR || errno == ENOBUFS));
 			if (len <= 0) {
-				bencode_get_str(bencode_dictionary_get(dict, "command"), &out);
-				LM_ERR("can't send command \"%.*s\" to RTP proxy <%s>\n", out.len, out.s, node->rn_url.s);
+				bencode_get_str(bencode_dictionary_get(dict, "command"), &cmd);
+				LM_ERR("can't send command \"%.*s\" to RTP proxy <%s>\n",
+					cmd.len, cmd.s, node->rn_url.s);
 				goto badproxy;
 			}
 			rtpengine_tout_ms = cfg_get(rtpengine,rtpengine_cfg,rtpengine_tout_ms);
@@ -2846,7 +2847,9 @@ send_rtpp_command(struct rtpp_node *node, bencode_item_t *dict, int *outlen)
 					len = recv(rtpp_socks[node->idx], buf, sizeof(buf)-1, 0);
 				} while (len == -1 && errno == EINTR);
 				if (len <= 0) {
-					LM_ERR("can't read reply for command \"%.*s\" from RTP proxy <%s>\n", out.len, out.s, node->rn_url.s);
+					bencode_get_str(bencode_dictionary_get(dict, "command"), &cmd);
+					LM_ERR("can't read reply for command \"%.*s\" from RTP proxy <%s>\n",
+						cmd.len, cmd.s, node->rn_url.s);
 					goto badproxy;
 				}
 				if (len >= (v[0].iov_len - 1) &&
@@ -2863,7 +2866,9 @@ send_rtpp_command(struct rtpp_node *node, bencode_item_t *dict, int *outlen)
 			}
 		}
 		if (i == rtpengine_retr) {
-			LM_ERR("timeout waiting reply for command \"%.*s\" from RTP proxy <%s>\n", out.len, out.s, node->rn_url.s);
+			bencode_get_str(bencode_dictionary_get(dict, "command"), &cmd);
+			LM_ERR("timeout waiting reply for command \"%.*s\" from RTP proxy <%s>\n",
+				cmd.len, cmd.s, node->rn_url.s);
 			goto badproxy;
 		}
 	}