Sync OpenBSD patchset 1150:

xfree is not particularly helpful, remove it. From Thomas Adam.

cmd-list-clients.c

@@ -18,6 +18,7 @@
 
 #include <sys/types.h>
 
+#include <stdlib.h>
 #include <string.h>
 #include <time.h>
 
@@ -76,7 +77,7 @@ cmd_list_clients_exec(struct cmd *self, struct cmd_ctx *ctx)
 
 		line = format_expand(ft, template);
 		ctx->print(ctx, "%s", line);
-		xfree(line);
+		free(line);
 
 		format_free(ft);
 	}