osutil: fix up check-code issues

contrib/check-code.py

@@ -177,7 +177,7 cpats = [
     (r'\([^\)]+\) \w+', "use (int)foo, not (int) foo"),
     (r'\S+ (\+\+|--)', "use foo++, not foo ++"),
     (r'\w,\w', "missing whitespace after ,"),
-    (r'\w[+/*]\w', "missing whitespace in expression"),
+    (r'^[^#]\w[+/*]\w', "missing whitespace in expression"),
     (r'^#\s+\w', "use #foo, not # foo"),
     (r'[^\n]\Z', "no trailing newline"),
 ]