scpi/usbtmc: Prototype fixes.

diff --git a/hardware/common/scpi_usbtmc.c b/hardware/common/scpi_usbtmc.c
index f7f0958eadeb9bcce3f3e6207d149f0d5c408726..9648722c20415c125de663461c95a1d421daea5e 100644 (file)
--- a/hardware/common/scpi_usbtmc.c
+++ b/hardware/common/scpi_usbtmc.c
@@ -111,7 +111,7 @@ SR_PRIV int scpi_usbtmc_receive(void *priv, char **scpi_response)
        return SR_OK;
 }
 
-SR_PRIV int scpi_usbtmc_read(void *priv, unsigned char *buf, int maxlen)
+SR_PRIV int scpi_usbtmc_read(void *priv, char *buf, int maxlen)
 {
        struct sr_usbtmc_dev_inst *usbtmc = priv;
        int len;
@@ -136,6 +136,11 @@ SR_PRIV int scpi_usbtmc_close(void *priv)
        return SR_OK;
 }
 
+static void scpi_usbtmc_free(void *priv)
+{
+       return sr_usbtmc_dev_inst_free(priv);
+}
+
 SR_PRIV struct sr_scpi_dev_inst *scpi_usbtmc_dev_inst_new(const char *device)
 {
        struct sr_scpi_dev_inst *scpi;
@@ -156,7 +161,7 @@ SR_PRIV struct sr_scpi_dev_inst *scpi_usbtmc_dev_inst_new(const char *device)
        scpi->receive = scpi_usbtmc_receive;
        scpi->read = scpi_usbtmc_read;
        scpi->close = scpi_usbtmc_close;
-       scpi->free = sr_usbtmc_dev_inst_free;
+       scpi->free = scpi_usbtmc_free;
        scpi->priv = usbtmc;
 
        return scpi;