chronovu-la8: Fix memory leak in hw_scan

Hardware scanning creates an ftdi_context before attempting to locate devices
based on PID/VID. If no devices are detected, execution jumps to cleanup. The
context is freed with free(), instead of ftdi_free().

We cannot assume that the libftdi context is stored in a contiguous memory
region, and thus cannot use a simple free. Case in point, this situation is
identified by valgrind as a "definitely lost" memory leak.

Use ftdi_free() instead of a simple free() in hw_scan(). Valgrind no longer
complains about a memory leak in this area.

clear_instances() does not need any modification, as it correctly uses
ftdi_free().

Signed-off-by: Alexandru Gagniuc <mr.nuke.me@gmail.com>

hardware/chronovu-la8/api.c

@@ -179,7 +179,7 @@ static GSList *hw_scan(GSList *options)
 err_close_ftdic:
 	(void) la8_close(devc); /* Log, but ignore errors. */
 err_free_ftdic:
-	free(devc->ftdic); /* NOT g_free()! */
+	ftdi_free(devc->ftdic); /* NOT free() or g_free()! */
 err_free_final_buf:
 	g_free(devc->final_buf);
 err_free_devc: