posix-timers: Preserve return value in clock_adjtime32()

The return value on success (>= 0) is overwritten by the return value of
put_old_timex32(). That works correct in the fault case, but is wrong for
the success case where put_old_timex32() returns 0.

Just check the return value of put_old_timex32() and return -EFAULT in case
it is not zero.

[ tglx: Massage changelog ]

Fixes: 3a4d44b61625 ("ntp: Move adjtimex related compat syscalls to native counterparts")
Signed-off-by: Chen Jun <[email protected]>
Signed-off-by: Thomas Gleixner <[email protected]>
Reviewed-by: Richard Cochran <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]

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