mavlink_helpers.h: Don't restart parsing on second CRC byte #897
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If an unknown message is received it would fail parsing due to bad CRC, thanks to the crc_extra. Before this change the parser would restart parsing on the second CRC byte. This can cause the parser to be out of sync and drop messages if the second CRC byte happens to be MAVLINK_STX. Now the parser will ignore the MAVLINK_STX if it was received as the second byte of a bad CRC message.
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If an unknown message is received it would fail parsing due to bad CRC, thanks to the crc_extra. Before this change the parser would restart parsing on the second CRC byte. This can cause the parser to be out of sync and drop messages if the second CRC byte happens to be MAVLINK_STX.
Now the parser will ignore the MAVLINK_STX if it was received as the second byte of a bad CRC message.
Fixes #881