memory: mtk-smi: handle positive return value for clk_bulk_prepare_enable

Function clk_bulk_prepare_enable() returns 0 for success or a negative
number for error, although the common style for the callers is to check
always for any non-zero return value (just like its implementation in
clk.h does).  Adjust the code to such coding style.

Signed-off-by: Yong Wu <[email protected]>
Reviewed-by: AngeloGioacchino Del Regno <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
[krzysztof: rewrite commit msg]
Signed-off-by: Krzysztof Kozlowski <[email protected]>

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