safehasattr: pass attribute name as string instead of bytes
This is a step toward replacing `util.safehasattr` usage with plain `hasattr`.
The builtin function behave poorly in Python2 but this was fixed in Python3.
These change are done one by one as they tend to have a small odd to trigger
puzzling breackage.
--- a/mercurial/patch.py Thu Feb 02 17:32:38 2023 +0100
+++ b/mercurial/patch.py Thu Feb 02 17:33:56 2023 +0100
@@ -168,7 +168,7 @@
mimeheaders = [b'content-type']
- if not util.safehasattr(stream, b'next'):
+ if not util.safehasattr(stream, 'next'):
# http responses, for example, have readline but not next
stream = fiter(stream)