aga: Fix initialization bug in aga_for_each_edge_info
The aga_for_each_edge_info macro is constructed so that if the edge_info
callback returns an error, the for loop terminates early and leaves the
_err parameter set to the error. On successful completion of the loop,
_err should be zero.
However, on a node with no edges, _err will not be initialized, meaning
that it could be non-zero even on successful (trivial) completion of the
loop. This fixes the bug.
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
projects / ccan / commit