Fix integer overflow caused by bad use of binary operator.
tree19d3696d9211f14c8d13edf1ab91d0e2e009d2a5
-rw-r--r-- 224 AUTHORS
-rw-r--r-- 966 CONTRIB
-rw-r--r-- 35147 COPYING
-rw-r--r-- 2459 ChangeLog
-rw-r--r-- 2570 INSTALL
-rw-r--r-- 7463 INSTALL.generic
-rw-r--r-- 2246 Makefile.in
-rw-r--r-- 1941 NEWS
-rw-r--r-- 1059 README
-rwxr-xr-x 87 autogen.sh
-rw-r--r-- 4072 configure.ac
drwxr-xr-x - doc
drwxr-xr-x - gnushogi
-rwxr-xr-x 5585 install-sh
drwxr-xr-x - misc
-rw-r--r-- 1139 version.h
drwxr-xr-x - xshogi