clk: hi3620: Fix memory leak in hi3620_mmc_clk_init()

clk: hi3620: Fix memory leak in hi3620_mmc_clk_init()

In cases where kcalloc() fails for the 'clk_data->clks' allocation, the
code path does not handle the failure gracefully, potentially leading
to a memory leak. This fix ensures proper cleanup by freeing the
allocated memory for 'clk_data' before returning.

Signed-off-by: Kuan-Wei Chiu <visitorckw@gmail.com>
Link: https://lore.kernel.org/r/20231210165040.3407545-1-visitorckw@gmail.com
Signed-off-by: Stephen Boyd <sboyd@kernel.org>