xtensa: use actual syscall number in do_syscall_trace_leave
Syscall may alter pt_regs structure passed to it, resulting in a
mismatch between syscall entry end syscall exit entries in the ftrace.
Temporary restore syscall field of the pt_regs for the duration of
do_syscall_trace_leave.
Signed-off-by: NMax Filippov <jcmvbkbc@gmail.com>
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