drivers: regulator: fix error case in regulator_supported_voltages() + split asserts

[etienne-lms]

2 changes:

• Fix case when .supported_voltages() handler is supported to assert voltage description when the handler succeeds and to use pre-filled fallback description when the handler returns TEE_ERROR_NOT_SUPPORTED instead of asserting @*desc content while that pointer was likely not initialized with a valid address.
  Fixes: af5b988 ("drivers: regulator: supported voltage consider levels bounds")
• Split assertions in regulator_supported_voltages() to ease debugging, providing a better indication of which condition is not fulfilled.

[etienne-lms]

@gatien or @patrickdelaunay, may I ask you to have a look at these 2 changes?

[GseoC]

The commit description of drivers: regulator: fix error case in regulator_supported_voltages() commit is a bit unclear to me, would you mind rephrasing it? maybe something like:

Fix case when .supported_voltages() handler exists but reports TEE_ERROR_NOT_SUPPORTED.
In this case, the regulator should use the fallback values.

I let you mix my suggestion with whatever you esteem right.

With this changed:

Acked-by: Gatien Chevallier <gatien.chevallier@foss.st.com>

[patrickdelaunay]

For the series:

Acked-by: Patrick Delaunay patrick.delaunay@foss.st.com

[etienne-lms]

The commit description of drivers: regulator: fix error case in regulator_supported_voltages() commit is a bit unclear to me, would you mind rephrasing it? maybe something like:

Thanks Gatien, indeed the sentence is far to long and not readable.

[etienne-lms]

I've rephrased in 1st commit message and applied the review patches to both.

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