Fix two small warnings.

hardware/demo/demo.c

@@ -23,6 +23,7 @@
 #include <unistd.h>
 #include <string.h>
 #include <sigrok.h>
+#include <sigrok-internal.h>
 #ifdef _WIN32
 #include <io.h>
 #include <fcntl.h>

hardware/openbench-logic-sniffer/ols.c

@@ -431,7 +431,6 @@ static int hw_init(const char *deviceinfo)
 		free(device_names[i]);
 	}
 
-hw_init_free_serial_params:
 	g_free(serial_params);
 hw_init_free_device_names:
 	g_free(device_names);