in_mqtt: fix OOB read from hardcoded remaining length overhead [Backport to 4.2]#11899
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The MQTT packet parser used hardcoded +2/-2 to account for the fixed header size (1 type byte + 1 remaining-length byte). This is only correct when the remaining length fits in a single byte (0-127). For remaining lengths 128+, the encoding uses 2-4 bytes, making the actual overhead 3-5 bytes. Replace the constant with the computed header size (buf_pos - pos + 1) so the bounds checks account for the actual number of remaining-length bytes consumed. Signed-off-by: Tristan <tristan@talencesecurity.com>
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Backporting of #11853.
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