fixed FPE in PUSCH UCI decoding

srslte/lib/phch/uci.c

@@ -299,8 +299,10 @@ int decode_cqi_long(srslte_uci_cqi_pusch_t *q, int16_t *q_bits, uint32_t Q,
 
     // Set viterbi normalization based on amplitude
     int16_t max = srslte_vec_max_abs_star_si(q->encoded_cqi_s, 3 * (nof_bits + 8));
-    if (max != 0) {
+    if (abs(max) > 100) {
       srslte_viterbi_set_gain_quant_s(&q->viterbi, (float) abs(max)/36); 
+    } else {
+      srslte_viterbi_set_gain_quant_s(&q->viterbi, 1); 
     }
     DEBUG("cconv_rx=", 0);
     if (SRSLTE_VERBOSE_ISDEBUG()) {