CLEANUP: log: fix comment of parse_logformat_string()
"fmt" is passed to parse_logformat_string, adjust comment
accordingly
diff --git a/src/log.c b/src/log.c
index c2153b8..5204de2 100644
--- a/src/log.c
+++ b/src/log.c
@@ -551,7 +551,7 @@
* You can set arguments using { } : %{many arguments}varname.
* The curproxy->conf.args.ctx must be set by the caller.
*
- * str: the string to parse
+ * fmt: the string to parse
* curproxy: the proxy affected
* list_format: the destination list
* options: LOG_OPT_* to force on every node