OF: Add of_match_ptr() macro

Add a macro of_match_ptr() that allows the .of_match_table
entry in the driver structures to be assigned without having
an #ifdef xxx NULL for the case that OF is not enabled

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>

include/linux/of.h

@@ -242,6 +242,7 @@ extern void of_attach_node(struct device_node *);
 extern void of_detach_node(struct device_node *);
 #endif
 
+#define of_match_ptr(_ptr)	(_ptr)
 #else /* CONFIG_OF */
 
 static inline bool of_have_populated_dt(void)
@@ -280,6 +281,7 @@ static inline const void *of_get_property(const struct device_node *node,
 	return NULL;
 }
 
+#define of_match_ptr(_ptr)	NULL
 #endif /* CONFIG_OF */
 
 static inline int of_property_read_u32(const struct device_node *np,