fm10k: NAPI polling routine must return actual work done

When fm10k_poll fully cleans rings it returns 0. This is incorrect as it
messes up the budget accounting in the core NAPI code. Fix this by
returning actual work done, capped at budget - 1 since the core doesn't
expect a return of the full budget when the driver modifies the NAPI
status.

Cc: Paolo Abeni <pabeni@redhat.com>
Cc: Venkatesh Srinivas <venkateshs@google.com>
Signed-off-by: NJacob Keller <jacob.e.keller@intel.com>
Acked-by: NPaolo Abeni <pabeni@redhat.com>
Tested-by: NKrishneil Singh <Krishneil.k.singh@intel.com>
Signed-off-by: NJeff Kirsher <jeffrey.t.kirsher@intel.com>

drivers/net/ethernet/intel/fm10k/fm10k_main.c

@@ -1484,7 +1484,7 @@ static int fm10k_poll(struct napi_struct *napi, int budget)
 	/* re-enable the q_vector */
 	fm10k_qv_enable(q_vector);
 
-	return 0;
+	return min(work_done, budget - 1);
 }
 
 /**