conf-parser: don't unescape parsed configuration strings by default

In many cases this might have a negative effect since we drop escaping
from strings where we better shouldn't have dropped it.

If unescaping makes sense for some settings we can readd it later again,
on a per-case basis.

https://bugs.freedesktop.org/show_bug.cgi?id=54522

src/shared/conf-parser.c

@@ -593,7 +593,7 @@ int config_parse_string(
         assert(rvalue);
         assert(data);
 
-        n = cunescape(rvalue);
+        n = strdup(rvalue);
         if (!n)
                 return -ENOMEM;
 

src/shared/util.c

@@ -4097,6 +4097,8 @@ static char *tag_to_udev_node(const char *tagvalue, const char *by) {
 }
 
 char *fstab_node_to_udev_node(const char *p) {
+        assert(p);
+
         if (startswith(p, "LABEL="))
                 return tag_to_udev_node(p+6, "label");