Implement a simple, consistent user interface for error handling.

We now have sufficient practical experience to know what we want,
so this is intended to be final:
- provide -Wlevel (warning, error or fatal) to select what you care about
- provide -Wstop to stop after parsing a file with warnings you care about
- provide consistent exit status codes for those warnings you care about
- fully document what warnings, errors and fatal errors mean
- remove all other cruft from the user interface, less is more:
- remove all -f knobs along with the whole -f option
- remove the old -Werror because calling warnings "fatal" is silly
- always finish parsing each file, unless fatal errors prevent that
This commit also includes a couple of related simplifications behind
the scenes regarding error handling.
Feedback and OK  kristaps@;  Joerg Sonnenberger (NetBSD) and
Sascha Wildner (DragonFly BSD) agree with the general direction.

1 files changed, 1 insertions, 1 deletions

diff --git a/mdoc_html.c b/mdoc_html.c
index 46b4e569..53889135 100644
--- a/mdoc_html.c
+++ b/mdoc_html.c
@@ -1183,7 +1183,7 @@ mdoc_bl_pre(MDOC_ARGS)
 	ord = malloc(sizeof(struct ord));
 	if (NULL == ord) {
 		perror(NULL);
-		exit(EXIT_FAILURE);
+		exit(MANDOCLEVEL_SYSERR);
 	}
 	ord->cookie = n;
 	ord->pos = 1;