hwmon: (applesmc) Check key count before proceeding
After reports from Chris and Josh Boyer of a rare crash in applesmc, Guenter pointed at the initialization problem fixed below. The patch has not been verified to fix the crash, but should be applied regardless. Reported-by: <jwboyer@fedoraproject.org> Suggested-by: NGuenter Roeck <linux@roeck-us.net> Signed-off-by: NHenrik Rydberg <rydberg@euromail.se> Cc: stable@vger.kernel.org Signed-off-by: NGuenter Roeck <linux@roeck-us.net>
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