samples: button: stop the app if device binding fails
Stop the app from running if device binding fails. Otherwise,
dereferencing NULL pointer will happen. This was caught by
Coverity.
Coverity-CID: 151988
Change-Id: I8245d938498a51123249fbd069935900ad660314
Signed-off-by:
Baohong Liu <baohong.liu@intel.com>
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