General: better handle an input of zero in float_to_linear

common/src/float_utils.c

@@ -8,6 +8,8 @@ uint16_t __xMR_FN_CALL float_to_linear(float val)
 
         if (val)
                 exp = ceilf(log2f(fabsf(val)) - log2f(1023));
+        else
+                return 0;
 
         if (exp < -16)
                 exp = -16;