PNP: Make dev_is_pnp() to be a function and export it for modules

Since we have a dev_is_pnp() macro that utilises the address of the
pnp_bus_type variable, the users, which can be compiled as modules,
will fail to build. Convert the macro to be a function and export it
to the modules to prevent build breakage.
Reported-by: Woody Suwalski <terraluna977@gmail.com>
Closes: https://lore.kernel.org/r/cc8a93b2-2504-9754-e26c-5d5c3bd1265c@gmail.com
Fixes: 2a49b45c ("PNP: Add dev_is_pnp() macro")
Signed-off-by: Andy Shevchenko <andy.shevchenko@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

drivers/pnp/driver.c

@@ -266,6 +266,12 @@ const struct bus_type pnp_bus_type = {
 	.dev_groups = pnp_dev_groups,
 };
 
+bool dev_is_pnp(const struct device *dev)
+{
+	return dev->bus == &pnp_bus_type;
+}
+EXPORT_SYMBOL_GPL(dev_is_pnp);
+
 int pnp_register_driver(struct pnp_driver *drv)
 {
 	drv->driver.name = drv->name;

include/linux/pnp.h

@@ -469,7 +469,7 @@ int compare_pnp_id(struct pnp_id *pos, const char *id);
 int pnp_register_driver(struct pnp_driver *drv);
 void pnp_unregister_driver(struct pnp_driver *drv);
 
-#define dev_is_pnp(d) ((d)->bus == &pnp_bus_type)
+bool dev_is_pnp(const struct device *dev);
 
 #else
 
@@ -502,7 +502,7 @@ static inline int compare_pnp_id(struct pnp_id *pos, const char *id) { return -E
 static inline int pnp_register_driver(struct pnp_driver *drv) { return -ENODEV; }
 static inline void pnp_unregister_driver(struct pnp_driver *drv) { }
 
-#define dev_is_pnp(d) false
+static inline bool dev_is_pnp(const struct device *dev) { return false; }
 
 #endif /* CONFIG_PNP */