ReplicatedPG: clearing a whiteout should create the object

This was uncovered by 7532194. Since
rbd_create() does a stat, the obc is cached as a whiteout, and the
subsequent create(EXCL) would fall through to return false from
maybe_create_new_object(). This would then skip adding a touch() to
the transaction.

Fixes: ceph#13281
Signed-off-by: Josh Durgin <[email protected]>

src/osd/ReplicatedPG.cc

@@ -3749,6 +3749,7 @@ bool ReplicatedPG::maybe_create_new_object(OpContext *ctx)
     dout(10) << __func__ << " clearing whiteout on " << obs.oi.soid << dendl;
     ctx->new_obs.oi.clear_flag(object_info_t::FLAG_WHITEOUT);
     --ctx->delta_stats.num_whiteouts;
+    return true;
   }
   return false;
 }