arch/frv/mb93090-mb00/pci-frv.c: fix build warning

The build of frv defconfig gives warning:

  arch/frv/mb93090-mb00/pci-frv.c:176:5: warning: ignoring return value of 'pci_assign_resource', declared with attribute warn_unused_result

Just print an error message to silence the warning.  We can not do much
here on error.

Link: http://lkml.kernel.org/r/1484256471-5379-1-git-send-email-sudipm.mukherjee@gmail.com
Signed-off-by: Sudip Mukherjee <sudip.mukherjee@codethink.co.uk>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

arch/frv/mb93090-mb00/pci-frv.c

@@ -147,7 +147,7 @@ static void __init pcibios_allocate_resources(int pass)
 static void __init pcibios_assign_resources(void)
 {
 	struct pci_dev *dev = NULL;
-	int idx;
+	int idx, err;
 	struct resource *r;
 
 	for_each_pci_dev(dev) {
@@ -172,8 +172,13 @@ static void __init pcibios_assign_resources(void)
 			 *  the BIOS forgot to do so or because we have decided the old
 			 *  address was unusable for some reason.
 			 */
-			if (!r->start && r->end)
-				pci_assign_resource(dev, idx);
+			if (!r->start && r->end) {
+				err = pci_assign_resource(dev, idx);
+				if (err)
+					dev_err(&dev->dev,
+						"Failed to assign new address to %d\n",
+						idx);
+			}
 		}
 	}
 }