i40e: check if vectors are already depleted when doing VMDq allocation

During MSI-X vector allocation for VMDq, a check for "no vectors left"
was missing, add it. This prevents more vectors to be allocated than
available.
Signed-off-by: Stefan Assmann <sassmann@kpanic.de>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/i40e/i40e_main.c

@@ -7674,6 +7674,10 @@ static int i40e_init_msix(struct i40e_pf *pf)
 		int vmdq_vecs_wanted = pf->num_vmdq_vsis * pf->num_vmdq_qps;
 		int vmdq_vecs = min_t(int, vectors_left, vmdq_vecs_wanted);
 
+		if (!vectors_left) {
+			pf->num_vmdq_msix = 0;
+			pf->num_vmdq_qps = 0;
+		} else {
 			/* if we're short on vectors for what's desired, we limit
 			 * the queues per vmdq.  If this is still more than are
 			 * available, the user will need to change the number of
@@ -7687,6 +7691,7 @@ static int i40e_init_msix(struct i40e_pf *pf)
 			v_budget += vmdq_vecs;
 			vectors_left -= vmdq_vecs;
 		}
+	}
 
 	pf->msix_entries = kcalloc(v_budget, sizeof(struct msix_entry),
 				   GFP_KERNEL);