MINOR: stats: Get the right prototype for stats_dump_html_end().

When the stat code was reorganized, and the prototype to
stats_dump_html_end() was moved to its own header, it missed the function
arguments. Fix that.

This should fix issue 2540.

Author: cognet

include/haproxy/stats-html.h

@@ -15,7 +15,7 @@ int stats_dump_fields_html(struct buffer *out, const struct field *stats,
                            struct show_stat_ctx *ctx);
 void stats_dump_html_px_hdr(struct stconn *sc, struct proxy *px);
 void stats_dump_html_px_end(struct stconn *sc, struct proxy *px);
-void stats_dump_html_end();
+void stats_dump_html_end(struct buffer *out);
 
 extern struct applet http_stats_applet;