Make dmi_find_device for !DMI case inline

Otherwise it will generate warnings and be generated many times.

Signed-off-by: Andi Kleen <ak@suse.de>

Index: linux/include/linux/dmi.h
===================================================================
--- linux.orig/include/linux/dmi.h
+++ linux/include/linux/dmi.h
@@ -70,7 +70,7 @@ extern struct dmi_device * dmi_find_devi
 
 static inline int dmi_check_system(struct dmi_system_id *list) { return 0; }
 static inline char * dmi_get_system_info(int field) { return NULL; }
-static struct dmi_device * dmi_find_device(int type, const char *name,
+static inline struct dmi_device * dmi_find_device(int type, const char *name,
 	struct dmi_device *from) { return NULL; }
 
 #endif