clk: samsung: exynos-clkout: Assign .num before accessing .hws

In the Linux kernel, the following vulnerability has been resolved:

clk: samsung: exynos-clkout: Assign .num before accessing .hws

Commit f316cdff8d67 ("clk: Annotate struct clk_hw_onecell_data with

__counted_by") annotated the hws member of 'struct clk_hw_onecell_data'

with __counted_by, which informs the bounds sanitizer (UBSAN_BOUNDS)

about the number of elements in .hws[], so that it can warn when .hws[]

is accessed out of bounds. As noted in that change, the __counted_by

member must be initialized with the number of elements before the first

array access happens, otherwise there will be a warning from each access

prior to the initialization because the number of elements is zero. This

occurs in exynos_clkout_probe() due to .num being assigned after .hws[]

has been accessed:

UBSAN: array-index-out-of-bounds in drivers/clk/samsung/clk-exynos-clkout.c:178:18

index 0 is out of range for type 'clk_hw *[*]'

Move the .num initialization to before the first access of .hws[],

clearing up the warning.