Remove one nop

sw/src/main.cpp

@@ -864,7 +864,6 @@ void readDataLoop(uint32_t blockSize, byte* dstptr)
     asm("nop");
     asm("nop");
     asm("nop");
-    asm("nop");
   uint32_t ret = PDREG->IDR;
   REQ_OFF();
   *dstptr = (byte)~(((ret ) & 0b11111111) );