Fix PQconninfoParse error message handling

The returned error message already includes a newline, but the callers
were adding their own when printing it out.

src/bin/pg_basebackup/streamutil.c

@@ -56,7 +56,7 @@ GetConnection(void)
 		conn_opts = PQconninfoParse(connection_string, &err_msg);
 		if (conn_opts == NULL)
 		{
-			fprintf(stderr, "%s: %s\n", progname, err_msg);
+			fprintf(stderr, "%s: %s", progname, err_msg);
 			exit(1);
 		}
 

src/bin/pg_dump/pg_dumpall.c

@@ -1752,7 +1752,7 @@ connectDatabase(const char *dbname, const char *connection_string,
 			conn_opts = PQconninfoParse(connection_string, &err_msg);
 			if (conn_opts == NULL)
 			{
-				fprintf(stderr, "%s: %s\n", progname, err_msg);
+				fprintf(stderr, "%s: %s", progname, err_msg);
 				exit_nicely(1);
 			}
 

src/bin/scripts/pg_isready.c

@@ -135,7 +135,7 @@ main(int argc, char **argv)
 		opts = PQconninfoParse(pgdbname, &errmsg);
 		if (opts == NULL)
 		{
-			fprintf(stderr, _("%s: %s\n"), progname, errmsg);
+			fprintf(stderr, _("%s: %s"), progname, errmsg);
 			exit(PQPING_NO_ATTEMPT);
 		}
 	}

src/interfaces/libpq/test/uri-regress.c

@@ -33,7 +33,7 @@ main(int argc, char *argv[])
 	opts = PQconninfoParse(argv[1], &errmsg);
 	if (opts == NULL)
 	{
-		fprintf(stderr, "uri-regress: %s\n", errmsg);
+		fprintf(stderr, "uri-regress: %s", errmsg);
 		return 1;
 	}