arm64: ptrace: Use NO_SYSCALL instead of -1 in syscall_trace_enter()
Setting a system call number of -1 is special, as it indicates that the
current system call should be skipped.
Use NO_SYSCALL instead of -1 when checking for this scenario, which is
different from the -1 returned due to a seccomp failure.
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Keno Fischer <keno@juliacomputing.com>
Cc: Luis Machado <luis.machado@linaro.org>
Signed-off-by: Will Deacon <will@kernel.org>
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