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
error_propagate_prepend() "behaves like error_prepend()", and error_prepend() uses "formatting @fmt, ... like printf()". error_prepend() checks its format string argument, but error_propagate_prepend() does not. Fix by addint the format attribute to error_propagate_prepend() and error_vprepend(). This would have caught the bug fixed in the previous commit. Missed in commit 4b5766488f "error: Fix use of error_prepend() with &error_fatal, &error_abort". Inspired-by: Stefan Weil <sw@weilnetz.de> Suggested-by: Eric Blake <eblake@redhat.com> Reviewed-by: Stefan Weil <sw@weilnetz.de> Reviewed-by: Markus Armbruster <armbru@redhat.com> Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com> Message-Id: <20200723171205.14949-1-philmd@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> [Commit message tweaked] Signed-off-by: Markus Armbruster <armbru@redhat.com>