Fix untranslatable assembly of libpq connection failure message

Even though this only affects the insertion of a parenthesized word,
it's unwise to assume that parentheses can pass through untranslated.
And in any case, the new version is clearer in the code and for
translators.

src/interfaces/libpq/fe-connect.c

@@ -1012,7 +1012,7 @@ connectFailureMessage(PGconn *conn, int errorno)
 #endif   /* HAVE_UNIX_SOCKETS */
 	{
 		char		host_addr[NI_MAXHOST];
-		bool		display_host_addr;
+		const char *displayed_host;
 		struct sockaddr_storage *addr = &conn->raddr.addr;
 
 		/*
@@ -1042,30 +1042,36 @@ connectFailureMessage(PGconn *conn, int errorno)
 		else
 			strcpy(host_addr, "???");
 
+		if (conn->pghostaddr && conn->pghostaddr[0] != '\0')
+			displayed_host = conn->pghostaddr;
+		else if (conn->pghost && conn->pghost[0] != '\0')
+			displayed_host = conn->pghost;
+		else
+			displayed_host = DefaultHost;
+
 		/*
 		 * If the user did not supply an IP address using 'hostaddr', and
 		 * 'host' was missing or does not match our lookup, display the
 		 * looked-up IP address.
 		 */
-		display_host_addr = (conn->pghostaddr == NULL) &&
-			((conn->pghost == NULL) ||
-			 (strcmp(conn->pghost, host_addr) != 0));
-
-		appendPQExpBuffer(&conn->errorMessage,
-						  libpq_gettext("could not connect to server: %s\n"
-			   "\tIs the server running on host \"%s\"%s%s%s and accepting\n"
-										"\tTCP/IP connections on port %s?\n"),
-						  SOCK_STRERROR(errorno, sebuf, sizeof(sebuf)),
-						  (conn->pghostaddr && conn->pghostaddr[0] != '\0')
-						  ? conn->pghostaddr
-						  : (conn->pghost && conn->pghost[0] != '\0')
-						  ? conn->pghost
-						  : DefaultHost,
-		/* display the IP address only if not already output */
-						  display_host_addr ? " (" : "",
-						  display_host_addr ? host_addr : "",
-						  display_host_addr ? ")" : "",
-						  conn->pgport);
+		if ((conn->pghostaddr == NULL) &&
+			(conn->pghost == NULL || strcmp(conn->pghost, host_addr) != 0))
+			appendPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("could not connect to server: %s\n"
+											"\tIs the server running on host \"%s\" (%s) and accepting\n"
+											"\tTCP/IP connections on port %s?\n"),
+							  SOCK_STRERROR(errorno, sebuf, sizeof(sebuf)),
+							  displayed_host,
+							  host_addr,
+							  conn->pgport);
+		else
+			appendPQExpBuffer(&conn->errorMessage,
+							  libpq_gettext("could not connect to server: %s\n"
+											"\tIs the server running on host \"%s\" and accepting\n"
+											"\tTCP/IP connections on port %s?\n"),
+							  SOCK_STRERROR(errorno, sebuf, sizeof(sebuf)),
+							  displayed_host,
+							  conn->pgport);
 	}
 }