arm64: stacktrace: Check kretprobe_find_ret_addr() return value

If kretprobe_find_ret_addr() fails to find the original return address,
it returns 0. Check for this case so that a reliable stacktrace won't
silently ignore it.

Signed-off-by: Mark Rutland <[email protected]>
Cc: Andrea della Porta <[email protected]>
Cc: Breno Leitao <[email protected]>
Cc: Josh Poimboeuf <[email protected]>
Cc: Miroslav Benes <[email protected]>
Cc: Petr Mladek <[email protected]>
Cc: Song Liu <[email protected]>
Cc: Will Deacon <[email protected]>
Reviewed-and-tested-by: Song Liu <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Catalin Marinas <[email protected]>

0 files changed, 0 insertions, 0 deletions