kunit: Fix missing kerneldoc comment

Add a missing kerneldoc comment for the 'test' test context parameter,
fixing the following warning:

include/kunit/test.h:492: warning: Function parameter or struct member 'test' not described in 'kunit_kfree_const'

Reported-by: Stephen Rothwell <[e-mail]>
Closes: https://lore.kernel.org/lkml/[e-mail]/
Fixes: f2c6dbd22017 ("kunit: Device wrappers should also manage driver name")
Signed-off-by: David Gow <[e-mail]>
Reviewed-by: Kees Cook <[e-mail]>
Signed-off-by: Shuah Khan <[e-mail]>

include/kunit/test.h

···
 
 /**
  * kunit_kfree_const() - conditionally free test managed memory
+ * @test: The test context object.
  * @x: pointer to the memory
  *
  * Calls kunit_kfree() only if @x is not in .rodata section.