Use only space_left, not sqes_left

src/blockstore/blockstore_impl.cpp

@@ -275,7 +275,7 @@ void blockstore_impl_t::check_wait(blockstore_op_t *op)
 {
     if (PRIV(op)->wait_for == WAIT_SQE)
     {
-        if (ringloop->sqes_left() < PRIV(op)->wait_detail)
+        if (ringloop->space_left() < PRIV(op)->wait_detail)
         {
             // stop submission if there's still no free space
 #ifdef BLOCKSTORE_DEBUG

src/blockstore/blockstore_internal.h

@@ -27,7 +27,7 @@
 #define IS_INSTANT(st) (((st) & BS_ST_TYPE_MASK) == BS_ST_DELETE || ((st) & BS_ST_INSTANT))
 
 #define BS_SUBMIT_CHECK_SQES(n) \
-    if (ringloop->sqes_left() < (n))\
+    if (ringloop->space_left() < (n))\
     {\
         /* Pause until there are more requests available */\
         PRIV(op)->wait_detail = (n);\