[CLEANUP] add a few "const char *" where appropriate
As suggested by Markus Elfring, a few "const char *" have replaced
some "char *" declarations where a function is not expected to
modify a value. It does not change the code but it helps detecting
coding errors.
diff --git a/include/common/cfgparse.h b/include/common/cfgparse.h
index 591f172..e21c4c5 100644
--- a/include/common/cfgparse.h
+++ b/include/common/cfgparse.h
@@ -32,9 +32,9 @@
extern int cfg_maxpconn;
extern int cfg_maxconn;
-int cfg_parse_global(char *file, int linenum, char **args);
-int cfg_parse_listen(char *file, int linenum, char **args);
-int readcfgfile(char *file);
+int cfg_parse_global(const char *file, int linenum, char **args);
+int cfg_parse_listen(const char *file, int linenum, char **args);
+int readcfgfile(const char *file);
#endif /* _COMMON_CFGPARSE_H */