clk: renesas: cpg-mssr: Fix memory leak in cpg_mssr_reserved_init()

clk: renesas: cpg-mssr: Fix memory leak in cpg_mssr_reserved_init()

In case of krealloc_array() failure, the current error handling just
returns from the function without freeing the original array.
Fix this memory leak by freeing the original array.

Fixes: 6aa1754764901668 ("clk: renesas: cpg-mssr: Ignore all clocks assigned to non-Linux system")
Signed-off-by: Yuan CHen <chenyuan@kylinos.cn>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://patch.msgid.link/20250908012810.4767-1-chenyuan_fl@163.com
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>