staging: greybus: Inline gb_audio_manager_module()

Convert 'gb_audio_manager_module' from a macro to a static
inline function, to make the relevant types apparent in the
definition and to benefit from the type checking performed by
the compiler at call sites.
Signed-off-by: Sumitra Sharma <sumitraartsy@gmail.com>
Link: https://lore.kernel.org/r/7470bf9d9a57e8bf27e55bd5e3791c5e0ee31385.1679732179.git.sumitraartsy@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/greybus/audio_manager_module.c

@@ -12,8 +12,11 @@
 
 #define to_gb_audio_module_attr(x)	\
 		container_of(x, struct gb_audio_manager_module_attribute, attr)
-#define to_gb_audio_module(x)		\
-		container_of(x, struct gb_audio_manager_module, kobj)
+
+static inline struct gb_audio_manager_module *to_gb_audio_module(struct kobject *kobj)
+{
+	return container_of(kobj, struct gb_audio_manager_module, kobj);
+}
 
 struct gb_audio_manager_module_attribute {
 	struct attribute attr;