Transceiver52M: Remove unnecessary UHD clock setting call

There is no need to create this method. Just call the UHD interface
directly.

Signed-off-by: Thomas Tsou <tom@tsou.cc>
diff --git a/Transceiver52M/UHDDevice.cpp b/Transceiver52M/UHDDevice.cpp
index d47e800..7a1a74d 100644
--- a/Transceiver52M/UHDDevice.cpp
+++ b/Transceiver52M/UHDDevice.cpp
@@ -293,7 +293,6 @@
 	smpl_buf *rx_smpl_buf;
 
 	void init_gains();
-	void set_ref_clk(bool ext_clk);
 	int set_master_clk(double rate);
 	int set_rates(double tx_rate, double rx_rate);
 	bool parse_dev_type();
@@ -376,14 +375,6 @@
 	return;
 }
 
-void uhd_device::set_ref_clk(bool ext_clk)
-{
-	if (ext_clk)
-		usrp_dev->set_clock_source("external");
-
-	return;
-}
-
 int uhd_device::set_master_clk(double clk_rate)
 {
 	double actual, offset, limit = 1.0;
@@ -543,7 +534,7 @@
 		return -1;
 
 	if (extref)
-		set_ref_clk(true);
+		usrp_dev->set_clock_source("external");
 
 	// Create TX and RX streamers
 	uhd::stream_args_t stream_args("sc16");