Re: fix:rtl8xxxu_core: mark symbols static where possible

Baoyou Xie [off-list ref] wrote:

We get 1 warning about global functions without a declaration
in the rtl8xxxu rtl8xxxu_core.c when building with W=1:
drivers/net/wireless/realtek/rtl8xxxu/rtl8xxxu_core.c:898:1: warning: no previous prototype for 'rtl8xxxu_gen1_h2c_cmd' [-Wmissing-prototypes]

In fact, this function is only used in the file in which it is declared
and don't need a declaration, but can be made static.
so this patch marks it 'static'.

Signed-off-by: Baoyou Xie <redacted>

The title should be "rtl8xxxu: ". See:

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches#subject_name

Also I assume Jes will take this.

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https://patchwork.kernel.org/patch/9302457/