regulator: build warning in regulator_lock_supply()

[Frank Rowand]

In the current Linus tree, new build warning.

When CONFIG_DEBUG_LOCK_ALLOC is not enabled,

  drivers/regulator/core.c: In function 'regulator_lock_supply':
  drivers/regulator/core.c:142:6: warning: unused variable 'i' [-Wunused-variable]


Introduced by commit

  9f01cd4a915e1 ("regulator: core: introduce function to lock regulators and its supplies")
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