Fix parsing of naked URIs in headers (#33)

We were never running the Addr action in the addr_uri_end production.

sip/msg_test.go

@@ -130,6 +130,25 @@ var msgTests = []msgTest{
 		},
 	},
 
+	{
+		name: "Naked URI",
+		s: "SIP/2.0 200 OK\r\n" +
+			"From: sip:127.0.0.1:1234\r\n" +
+			"\r\n",
+		msg: sip.Msg{
+			VersionMajor: 2,
+			Status:       200,
+			Phrase:       "OK",
+			From: &sip.Addr{
+				Uri: &sip.URI{
+					Scheme: "sip",
+					Host:   "127.0.0.1",
+					Port:   1234,
+				},
+			},
+		},
+	},
+
 	{
 		name: "Line Continuation Warning",
 		s: "SIP/2.0 200 OK\r\n" +

sip/sip.rl

@@ -422,7 +422,7 @@ addr_angled_end    = CRLF @Addr @goto_header
                    | SEMI <: any @hold @goto_addr_param
                    | COMMA <: any @Addr @hold @goto_addr;
 addr_angled       := addr_display? addr_spec addr_angled_end;
-addr_uri_end       = CRLF %Addr @goto_header
+addr_uri_end       = CRLF @Addr @goto_header
                    | SEMI <: any @hold @goto_addr_param
                    | COMMA <: any @Addr @hold @goto_addr;
 addr_uri          := ( uri - ";" ) %AddrUri addr_uri_end;