Make tapdisk_vbd_contains_dead_rings static inline

Move into the header as a proper static inline.

Signed-off-by: Jason Andryuk <jandryuk@gmail.com>

Author: jandryuk

drivers/tapdisk-vbd.c

@@ -1875,10 +1875,3 @@ tapdisk_vbd_stats(td_vbd_t *vbd, td_stats_t *st)
 
 	tapdisk_stats_leave(st, '}');
 }
-
-
-bool
-tapdisk_vbd_contains_dead_rings(td_vbd_t * vbd)
-{
-    return !list_empty(&vbd->dead_rings);
-}

drivers/tapdisk-vbd.h

@@ -246,5 +246,9 @@ void tapdisk_vbd_complete_block_status_request(td_request_t, int);
 /**
  * Tells whether the VBD contains at least one dead ring.
  */
-bool tapdisk_vbd_contains_dead_rings(td_vbd_t * vbd);
+static inline bool
+tapdisk_vbd_contains_dead_rings(td_vbd_t * vbd)
+{
+    return !list_empty(&vbd->dead_rings);
+}
 #endif