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USRPDevice: fix cast of short to uint32_t

Fix building with --enable-werror and GCC 12:

USRPDevice.cpp:591:30: error: 'data' is used uninitialized [-Werror=uninitialized]
  591 |   *wordPtr = host_to_usrp_u32(*wordPtr);
      |              ~~~~~~~~~~~~~~~~^~~~~~~~~~

Related: OS#6057
Change-Id: I806d8c1432cb20efca1830a2752a4cbc70384b54
---
M Transceiver52M/device/usrp1/USRPDevice.cpp
1 file changed, 17 insertions(+), 2 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-trx refs/changes/37/33737/1

diff --git a/Transceiver52M/device/usrp1/USRPDevice.cpp b/Transceiver52M/device/usrp1/USRPDevice.cpp
index 5c40aa8..bf114b6 100644
--- a/Transceiver52M/device/usrp1/USRPDevice.cpp
+++ b/Transceiver52M/device/usrp1/USRPDevice.cpp
@@ -587,8 +587,7 @@
 {
 #ifndef SWLOOPBACK
   short data[] = {0x00,0x02,0x00,0x00};
-  uint32_t *wordPtr = (uint32_t *) data;
-  *wordPtr = host_to_usrp_u32(*wordPtr);
+  *data = host_to_usrp_short(*data);
   bool tmpUnderrun;
 
   std::vector<short *> buf(1, data);

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