firmware: hardcode the debug message for -ENOENT

When no file /path was found, the error code of -ENOENT
enumerated in errno-base.h, is returned. Stating clearly that
the file was not found is much more useful for debugging, So
let's be explicit about that.

Signed-off-by: John Zhao <[e-mail]>
Acked-by: Luis Chamberlain <[e-mail]>
Signed-off-by: Greg Kroah-Hartman <[e-mail]>

drivers/base/firmware_loader/main.c

···
 		rc = kernel_read_file_from_path(path, &fw_priv->data, &size,
 						msize, id);
 		if (rc) {
-			if (rc == -ENOENT)
-				dev_dbg(device, "loading %s failed with error %d\n",
-					 path, rc);
-			else
+			if (rc != -ENOENT)
 				dev_warn(device, "loading %s failed with error %d\n",
 					 path, rc);
+			else
+				dev_dbg(device, "loading %s failed for no such file or directory.\n",
+					 path);
 			continue;
 		}
 		dev_dbg(device, "direct-loading %s\n", fw_priv->fw_name);