peekFrameLength() should abide by mutex locks on txQueue's;

src/host/dmr/Slot.cpp

@@ -312,6 +312,8 @@ bool Slot::processFrame(uint8_t *data, uint32_t len)
 
 uint32_t Slot::peekFrameLength()
 {
+    std::lock_guard<std::mutex> lock(m_queueLock);
+
     if (m_txQueue.isEmpty() && m_txImmQueue.isEmpty())
         return 0U;
 

src/host/nxdn/Control.cpp

@@ -465,6 +465,8 @@ bool Control::processFrame(uint8_t* data, uint32_t len)
 
 uint32_t Control::peekFrameLength()
 {
+    std::lock_guard<std::mutex> lock(m_queueLock);
+
     if (m_txQueue.isEmpty() && m_txImmQueue.isEmpty())
         return 0U;
 

src/host/p25/Control.cpp

@@ -674,6 +674,8 @@ bool Control::processFrame(uint8_t* data, uint32_t len)
 
 uint32_t Control::peekFrameLength()
 {
+    std::lock_guard<std::mutex> lock(m_queueLock);
+
     if (m_txQueue.isEmpty() && m_txImmQueue.isEmpty())
         return 0U;