macintosh: Don't assume i2c device probing always succeeds

macintosh: Don't assume i2c device probing always succeeds

commit 6f6b35e133fe4313277b30fc1a7ea313875ea6c9 upstream.

If i2c device probing fails, then there is no driver to dereference
after calling i2c_new_device(). Stop assuming that probing will always
succeed, to avoid NULL pointer dereferences. We have an easier access
to the driver anyway.

Signed-off-by: Jean Delvare <khali@linux-fr.org>
Tested-by: Tim Shepard <shep@alum.mit.edu>
Cc: Colin Leroy <colin@colino.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>