md: proper extern for mdp_major

This patch adds a proper extern for mdp_major in include/linux/raid/md.h

Signed-off-by: Adrian Bunk <[e-mail]>
Signed-off-by: Neil Brown <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
Signed-off-by: Linus Torvalds <[e-mail]>

include/linux/raid/md.h

···
  */
 #define MD_PATCHLEVEL_VERSION           3
 
+extern int mdp_major;
+
 extern int register_md_personality (struct mdk_personality *p);
 extern int unregister_md_personality (struct mdk_personality *p);
 extern mdk_thread_t * md_register_thread (void (*run) (mddev_t *mddev),

init/do_mounts_md.c

···
 
 static int md_setup_ents __initdata;
 
-extern int mdp_major;
 /*
  * Parse the command-line parameters given our kernel, but do not
  * actually try to invoke the MD device now; that is handled by