wined3d: Don't write past the end of the buffer's conversion_map.
[wine] / dlls / shell.dll16 /
drwxr-xr-x   ..
-rw-r--r-- 315 Makefile.in
-rw-r--r-- 20365 shell.c
-rw-r--r-- 2116 shell.dll16.spec
-rw-r--r-- 973 version.rc