Crash when handling NFC events with Web IDE connected

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AntiCat
I think, I've identified the possible source for this issue Source:
```
/* Take into account only number of whole bytes */
uint32_t rx_data_size = ((NRF_NFCT->RXD.AMOUNT  ...) - NFC_CRC_SIZE;
```
In some cases NRF_NFCT->RXD.AMOUNT is 0. 0 - NFC_CRC_SIZE with unsigned datatype results in a very large number.

Btw: I also don't like that nordic is accessing data from this buffer without verifying, that the received amount of data makes some sense:
```
if(m_nfc_rx_buffer[0] == NFC_SLP_REQ_CMD)
```

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