clk: qcom: clk-spmi-pmic-div: Annotate struct spmi_pmic_div_clk_cc with __counted_by

Prepare for the coming implementation by GCC and Clang of the __counted_by
attribute. Flexible array members annotated with __counted_by can have
their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS
(for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family
functions).

As found with Coccinelle[1], add __counted_by for struct spmi_pmic_div_clk_cc.

[1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci

Cc: Bjorn Andersson <[email protected]>
Cc: Andy Gross <[email protected]>
Cc: Konrad Dybcio <[email protected]>
Cc: Michael Turquette <[email protected]>
Cc: Stephen Boyd <[email protected]>
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Kees Cook <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Reviewed-by: Gustavo A. R. Silva <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>

drivers/clk/qcom/clk-spmi-pmic-div.c

@@ -177,7 +177,7 @@ static const struct clk_ops clk_spmi_pmic_div_ops = {
 
 struct spmi_pmic_div_clk_cc {
 	int		nclks;
-	struct clkdiv	clks[];
+	struct clkdiv	clks[] __counted_by(nclks);
 };
 
 static struct clk_hw *