regulator: core: Fix default return value for _get()

Now that we are defaulting to providing dummy regulators fix the logic
for substituting a dummy by making the default return code -EPROBE_DEFER.

Reported-by: Thierry Reding <[email protected]>
Tested-by: Thierry Reding <[email protected]>
Signed-off-by: Mark Brown <[email protected]>
1 file changed