MIPS: jump_label: Fix compat branch range check

MIPS: jump_label: Fix compat branch range check

commit dd5f3876f0232e0655bef5fd7e327dfa29fdfeed upstream.

Cast upper bound of branch range to long to do signed compare,
avoid negative offset trigger this warning.

Fixes: 898858b8cd03 ("MIPS: jump_label: Use compact branches for >= r6")
Signed-off-by: Jiaxun Yang <jiaxun.yang@flygoat.com>
Cc: stable@vger.kernel.org
Reviewed-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>