launch: direct: Print \n after printing qemu command line.

This makes it easier to see error messages printed by qemu.

(cherry picked from commit 19ee64303e)
(cherry picked from commit 847c515043)

src/launch-appliance.c

@@ -770,6 +770,8 @@ print_qemu_command_line (guestfs_h *g, char **argv)
     if (needs_quote) fputc ('\'', stderr);
     i++;
   }
+
+  fputc ('\n', stderr);
 }
 
 static void parse_qemu_version (guestfs_h *g);