uml: audio: fix -Wmissing-variable-declarations

I'm looking to enable -Wmissing-variable-declarations behind W=1. 0day
bot spotted the following instance:

  arch/um/drivers/hostaudio_kern.c:316:3: warning: no previous extern
  declaration for non-static variable 'module_data'
  [-Wmissing-variable-declarations]
  } module_data;
    ^
  arch/um/drivers/hostaudio_kern.c:313:1: note: declare 'static' if the
  variable is not intended to be used outside of this translation unit
  struct {
  ^

This symbol is not referenced by more than one translation unit, so give
it static storage.

Reported-by: kernel test robot <[email protected]>
Closes: https://lore.kernel.org/llvm/[email protected]/
Signed-off-by: Nick Desaulniers <[email protected]>
Signed-off-by: Richard Weinberger <[email protected]>

arch/um/drivers/hostaudio_kern.c

@@ -310,7 +310,7 @@ static const struct file_operations hostmixer_fops = {
 	.release        = hostmixer_release,
 };
 
-struct {
+static struct {
 	int dev_audio;
 	int dev_mixer;
 } module_data;