DMI: create dmi_get_slot()

This simply allows other sub-systems (such as ACPI)
to access and print out slots in static dmi_ident[].

Signed-off-by: Len Brown <len.brown@intel.com>
diff --git a/include/linux/dmi.h b/include/linux/dmi.h
index b1251b2..5b42a65 100644
--- a/include/linux/dmi.h
+++ b/include/linux/dmi.h
@@ -79,6 +79,7 @@
 extern int dmi_get_year(int field);
 extern int dmi_name_in_vendors(const char *str);
 extern int dmi_available;
+extern char *dmi_get_slot(int slot);
 
 #else
 
@@ -89,6 +90,7 @@
 static inline int dmi_get_year(int year) { return 0; }
 static inline int dmi_name_in_vendors(const char *s) { return 0; }
 #define dmi_available 0
+static inline char *dmi_get_slot(int slot) { return NULL; }
 
 #endif