dm vdo: remove unused struct 'uds_attribute'

'uds_attribute' is unused since
commit a9da0fb6 ("dm vdo: remove all sysfs interfaces").

Remove it.
Signed-off-by: Dr. David Alan Gilbert <linux@treblig.org>
Signed-off-by: Matthew Sakai <msakai@redhat.com>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>

drivers/md/dm-vdo/dedupe.c

@@ -148,11 +148,6 @@
 #include "vdo.h"
 #include "wait-queue.h"
 
-struct uds_attribute {
-	struct attribute attr;
-	const char *(*show_string)(struct hash_zones *hash_zones);
-};
-
 #define DEDUPE_QUERY_TIMER_IDLE 0
 #define DEDUPE_QUERY_TIMER_RUNNING 1
 #define DEDUPE_QUERY_TIMER_FIRED 2