Don't use old_spacing-1 if old_spacing already has the minimum value.
[wine] / dlls / lzexpand /
drwxr-xr-x   ..
-rw-r--r-- 66 .cvsignore
-rw-r--r-- 323 Makefile.in
-rw-r--r-- 477 lz32.spec
-rw-r--r-- 436 lzexpand.spec
-rw-r--r-- 4064 lzexpand16.c
-rw-r--r-- 14855 lzexpand_main.c