kernel/sys.c: for setfsuid(), return the current uid when error occurs

[Chen Gang]

They are 2 related patches for setfsuid().

Patch 1 for bug fix: return the current uid when error occurs.
Patch 2 for cleaning code: remove useless variable 'old_fsuid'.

Signed-off-by: Chen Gang <gang.chen@xxxxxxxxxxx>
--
 kernel/sys.c |   14 ++++++--------
 1 files changed, 6 insertions(+), 8 deletions(-)
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