powernv/pci: Print an error when device enable is blocked

If the platform decides to block enabling the device nothing is printed
currently. This can lead to some confusion since the dmesg output will
usually print an error with no context e.g.

	e1000e: probe of 0022:01:00.0 failed with error -22

This shouldn't be spammy since pci_enable_device() already prints a
messages when it succeeds.
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200409061337.9187-1-oohall@gmail.com

arch/powerpc/platforms/powernv/pci-ioda.c

@@ -2613,8 +2613,10 @@ static bool pnv_pci_enable_device_hook(struct pci_dev *dev)
 		return true;
 
 	pdn = pci_get_pdn(dev);
-	if (!pdn || pdn->pe_number == IODA_INVALID_PE)
+	if (!pdn || pdn->pe_number == IODA_INVALID_PE) {
+		pci_err(dev, "pci_enable_device() blocked, no PE assigned.\n");
 		return false;
+	}
 
 	return true;
 }