Fixed typo in the case operator.

mysys/ma_dyncol.c

@@ -4039,6 +4039,7 @@ mariadb_dyncol_val_double(double *dbl, DYNAMIC_COLUMN_VALUE *val)
         *dbl= strtod(str, &end);
         if (*end != '\0')
           rc= ER_DYNCOL_TRUNCATED;
+        break;
       }
     case DYN_COL_DECIMAL:
       if (decimal2double(&val->x.decimal.value, dbl) != E_DEC_OK)