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fix changed checking order to avoid possible access violation
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@ -220,8 +220,8 @@ uint8_t transceiver_register(transceiver_type_t t, int pid)
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uint8_t i;
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/* find pid in registered threads or first unused space */
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for (i = 0; ((reg[i].pid != pid) &&
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(i < TRANSCEIVER_MAX_REGISTERED) &&
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for (i = 0; ((i < TRANSCEIVER_MAX_REGISTERED) &&
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(reg[i].pid != pid) &&
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(reg[i].transceivers != TRANSCEIVER_NONE)); i++);
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if (i >= TRANSCEIVER_MAX_REGISTERED) {
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