Adding "const" qualifier to the argument of decimal_actual_fraction().

include/decimal.h

@@ -51,7 +51,7 @@ int decimal2longlong(const decimal_t *from, longlong *to);
 int longlong2decimal(longlong from, decimal_t *to);
 int decimal2double(const decimal_t *from, double *to);
 int double2decimal(double from, decimal_t *to);
-int decimal_actual_fraction(decimal_t *from);
+int decimal_actual_fraction(const decimal_t *from);
 int decimal2bin(const decimal_t *from, uchar *to, int precision, int scale);
 int bin2decimal(const uchar *from, decimal_t *to, int precision, int scale);
 

strings/decimal.c

@@ -283,7 +283,7 @@ static dec1 *remove_leading_zeroes(const decimal_t *from, int *intg_result)
     from    number for processing
 */
 
-int decimal_actual_fraction(decimal_t *from)
+int decimal_actual_fraction(const decimal_t *from)
 {
   int frac= from->frac, i;
   dec1 *buf0= from->buf + ROUND_UP(from->intg) + ROUND_UP(frac) - 1;