util: fix argconfig_match_val() to check option value length

Currently get/set-feature feature-id "fdp" option value is not parsed.
Handled as ambiguous by the multiple matches with the "fdp-events" option.

Fixes: 1b3ba5d ("util: reduce complexity of argconfig_parse_val()")
Signed-off-by: Tokunori Ikegami <[email protected]>

Author: ikegami-t

util/argconfig.c

@@ -263,6 +263,9 @@ argconfig_match_val(struct argconfig_opt_val *v, const char *str)
 		if (strncasecmp(str, v->str, len))
 			continue;
 
+		if (len == strlen(v->str))
+			return v;
+
 		if (match)
 			return NULL; /* multiple matches; input is ambiguous */