Remove the delay when using COS.

NXDNTX.cpp

@@ -82,7 +82,7 @@ void CNXDNTX::process()
       m_poBuffer[m_poLen++] = NXDN_PREAMBLE[2U];
     } else {
       for (uint8_t i = 0U; i < NXDN_FRAME_LENGTH_BYTES; i++) {
-        uint8_t c;
+        uint8_t c = 0U;
         m_buffer.get(c);
         m_poBuffer[m_poLen++] = c;
       }
@@ -168,4 +168,3 @@ uint8_t CNXDNTX::getSpace() const
 {
   return m_buffer.getSpace() / NXDN_FRAME_LENGTH_BYTES;
 }
-