fexc: Default unquoted values to string type

Vendor-provided .fex files have repeatedly shown key-value pairs
(assignments) where the value is an identifier-style string *not*
surrounded by double quotes. The corresponding .bin files confirm
that such values end up as "string" type entries.

So far, our .fex parser has choked on these values. The commit
changes this behavior and treats them as strings now, to allow
processing 'original' .fex without adjustments.
Signed-off-by: Bernhard Nortmann <bernhard.nortmann@web.de>

script_fex.c

@@ -348,7 +348,15 @@ int script_parse_fex(FILE *in, const char *filename, struct script *script)
 					continue;
 				}
 			} else {
-				goto invalid_char_at_p;
+				/* goto invalid_char_at_p; */
+				errf("Warning: %s:%zu: unquoted value '%s', assuming string\n",
+				     filename, line, p);
+				if (script_string_entry_new(last_section, key, pe-p, p)) {
+					pr_debug("%s.%s = \"%s\"\n",
+						 last_section->name, key, p);
+					continue;
+				}
+				perror("malloc");
 			}
 			errf("E: %s:%zu: parse error at %zu.\n",
 			     filename, line, p-buffer+1);