[ruby-libvirt] Don't make volume upload zero bytes

[Guido Günther <agx@xxxxxxxxxxx>]

The virStreamSourceFunc internal_sendall currently returns the first
value passed in from the block, which according the ruby-libvirt docs
should be zero:

  The send block should return an array of 2 elements; the first element
  should be the return code from the block (-1 for error, 0 otherwise)

But according to the libvirt docs of virStreamSourceFunc this indicates
EOF:

  Returns:  the number of bytes filled, 0 upon end of file, or -1 upon error

So return the size of the buffer to unbreak volume uploads.
---
 ext/libvirt/stream.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/ext/libvirt/stream.c b/ext/libvirt/stream.c
index 1353dc9..c171535 100644
--- a/ext/libvirt/stream.c
+++ b/ext/libvirt/stream.c
@@ -131,7 +131,7 @@ static int internal_sendall(virStreamPtr RUBY_LIBVIRT_UNUSED(st), char *data,
 
     memcpy(data, RSTRING_PTR(buffer), RSTRING_LEN(buffer));
 
-    return NUM2INT(retcode);
+    return RSTRING_LEN(buffer);
 }
 
 /*
-- 
2.8.1

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