core/conv: Really only consider error for non-zero soft values
This should have been done with 1dd7c84733b20ba776510369e9daba1a822c5b44
but somehow was missed and only applied to the 'finish' method and
not the 'scan' method.
Signed-off-by: Sylvain Munaut <tnt@246tNt.com>
diff --git a/src/conv.c b/src/conv.c
index 00a5532..7a8be8c 100644
--- a/src/conv.c
+++ b/src/conv.c
@@ -310,9 +310,12 @@
m = 1 << (code->N - 1); /* mask for 'out' bit selection */
for (j=0; j<code->N; j++) {
- ov = (out & m) ? -127 : 127; /* sbit_t value for it */
- e = ((int)in_sym[j]) - ov; /* raw error for this bit */
- nae += (e * e) >> 9; /* acc the squared/scaled value */
+ int is = (int)in_sym[j];
+ if (is) {
+ ov = (out & m) ? -127 : 127; /* sbit_t value for it */
+ e = is - ov; /* raw error for this bit */
+ nae += (e * e) >> 9; /* acc the squared/scaled value */
+ }
m >>= 1; /* next mask bit */
}