clk: tegra: Don't warn three times about failure to unregister

tegra124_dfll_fcpu_remove() calls tegra_dfll_unregister() and the former
emits an error message if the latter fails. In that case
tegra_dfll_unregister() already printed an error message. Additionally
tegra124_dfll_fcpu_remove() returns an error code which results in yet
another warning emitted by platform_remove().

So drop the error message from tegra124_dfll_fcpu_remove() and let it
return 0. (Retuning 0 has no side effect but suppressing the error
message in platform_remove().)

Also add two comments about exiting early being wrong. This is something
that needs fixing separately.

Signed-off-by: Uwe Kleine-König <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Stephen Boyd <[email protected]>

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