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Not having power is a pretty serious error so check that we are able to enable the supply and error out if we can't. Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com> Cc: stable@vger.kernel.org #3.8+; 3.0+ will need manual backport Signed-off-by: Guenter Roeck <linux@roeck-us.net>