Don't use old_spacing-1 if old_spacing already has the minimum value.
[wine] / dlls / devenum /
drwxr-xr-x   ..
-rw-r--r-- 59 .cvsignore
-rw-r--r-- 227 Makefile.in
-rw-r--r-- 131 devenum.spec
-rw-r--r-- 258 devenum_main.c