libavcodec/ac3dec.c:392: error: Uninitialized Value
  The value read from dexp[_] was never initialized.

libavcodec/ac3dec.c:392:9: 
390.     prevexp = absexp;
391.     for(i=0,j=0; i<ngrps*3; i++) {
392.         prevexp += dexp[i] - 2;
             ^
393.         if (prevexp > 24U)
394.             return -1;

static int decode_exponents(GetBitContext *gbc, int exp_strategy, int ngrps,
                            uint8_t absexp, int8_t *dexps)
{
    int i, j, grp, group_size;
    int dexp[256];
    int expacc, prevexp;
    group_size = exp_strategy + (exp_strategy == EXP_D45);
    for(grp=0,i=0; grp<ngrps; grp++) {
        expacc = get_bits(gbc, 7);
        dexp[i++] = ungroup_3_in_7_bits_tab[expacc][0];
        dexp[i++] = ungroup_3_in_7_bits_tab[expacc][1];
        dexp[i++] = ungroup_3_in_7_bits_tab[expacc][2];
    }
    prevexp = absexp;
    for(i=0,j=0; i<ngrps*3; i++) {
        prevexp += dexp[i] - 2;
        if (prevexp > 24U)
            return -1;
        switch (group_size) {
            case 4: dexps[j++] = prevexp;
                    dexps[j++] = prevexp;
            case 2: dexps[j++] = prevexp;
            case 1: dexps[j++] = prevexp;
        }
    }
    return 0;
}
['static int decode_exponents(GetBitContext *gbc, int exp_strategy, int ngrps,\n                            uint8_t absexp, int8_t *dexps)\n{\n    int i, j, grp, group_size;\n    int dexp[256];\n    int expacc, prevexp;\n    group_size = exp_strategy + (exp_strategy == EXP_D45);\n    for(grp=0,i=0; grp<ngrps; grp++) {\n        expacc = get_bits(gbc, 7);\n        dexp[i++] = ungroup_3_in_7_bits_tab[expacc][0];\n        dexp[i++] = ungroup_3_in_7_bits_tab[expacc][1];\n        dexp[i++] = ungroup_3_in_7_bits_tab[expacc][2];\n    }\n    prevexp = absexp;\n    for(i=0,j=0; i<ngrps*3; i++) {\n        prevexp += dexp[i] - 2;\n        if (prevexp > 24U)\n            return -1;\n        switch (group_size) {\n            case 4: dexps[j++] = prevexp;\n                    dexps[j++] = prevexp;\n            case 2: dexps[j++] = prevexp;\n            case 1: dexps[j++] = prevexp;\n        }\n    }\n    return 0;\n}']