mips n32, x32: fix printing of times syscall return value

mips n32, x32: fix printing of times syscall return value

As times syscall returns kernel's long value, it has to be printed as
RVAL_LUDECIMAL on systems where long type is less than kernel's long.

* times.c (SYS_FUNC(times)) [RVAL_LUDECIMAL && !IN_MPERS]:
Return RVAL_LUDECIMAL instead of RVAL_UDECIMAL.