aoe: initialize sysminor to avoid compiler warning

Because the minor_get and related functions use the return values for
errors, the compiler doesn't know that sysminor will always either 1) be
initialized in aoedev_by_aoeaddr by the call to minor_get, or 2) be
unused as the "goto out" is executed.

This patch avoids the compiler warning.
Signed-off-by: Ed Cashin <ecashin@coraid.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

drivers/block/aoe/aoedev.c

@@ -383,7 +383,7 @@ aoedev_by_aoeaddr(ulong maj, int min, int do_alloc)
 	struct aoedev *d;
 	int i;
 	ulong flags;
-	ulong sysminor;
+	ulong sysminor = 0;
 
 	spin_lock_irqsave(&devlist_lock, flags);