[PATCH 2/2] generic/15[78]: fix error messages in the golden output

[Christoph Hellwig]

> Shouldn't these be Invalid argument just like the
> to a device case above or the clone case?

E.g. something like this on top of your patch:


diff --git a/tests/generic/158.out b/tests/generic/158.out
index 1210429..dff3692 100644
--- a/tests/generic/158.out
+++ b/tests/generic/158.out
@@ -16,9 +16,9 @@ XFS_IOC_FILE_EXTENT_SAME: Invalid argument
 Try to dedupe to a dir
 TEST_DIR/test-158/dir1: Is a directory
 Try to dedupe to a device
-dedupe: Operation not supported
+dedupe: Invalid argument
 Try to dedupe to a fifo
-dedupe: Operation not supported
+dedupe: Invalid argument
 Try to dedupe an append-only file
 Dedupe two files
 Check scratch fs