swsusp: Fix swap_type_of

There is a bug in mm/swapfile.c#swap_type_of() that makes swsusp only be
able to use the first active swap partition as the resume device.  Fix it.
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Cc: Hugh Dickins <hugh@veritas.com>
Acked-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

mm/swapfile.c

@@ -440,11 +440,12 @@ int swap_type_of(dev_t device)
 
 		if (!(swap_info[i].flags & SWP_WRITEOK))
 			continue;
+
 		if (!device) {
 			spin_unlock(&swap_lock);
 			return i;
 		}
-		inode = swap_info->swap_file->f_dentry->d_inode;
+		inode = swap_info[i].swap_file->f_dentry->d_inode;
 		if (S_ISBLK(inode->i_mode) &&
 		    device == MKDEV(imajor(inode), iminor(inode))) {
 			spin_unlock(&swap_lock);