unlzo: fix input buffer free

unlzo modifies the pointer to in_buf, so we have to free the original
buffer, not the modified pointer.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Committed-by: Jan Beulich <jbeulich@suse.com>

xen/common/unlzo.c

@@ -254,7 +254,7 @@ STATIC int INIT unlzo(u8 *input, unsigned int in_len,
 	ret = 0;
 exit_2:
 	if (!input)
-		free(in_buf);
+		free(in_buf_save);
 exit_1:
 	if (!output)
 		free(out_buf);