CASTOR-5106 RFE: Improve the const correctness of Cns_chclass()

Fixed.

h/Cns_api.h

@@ -235,7 +235,7 @@ EXTERN_C int Cns_access (const char *, int);
 EXTERN_C int Cns_accessUser (const char *, int, uid_t, gid_t);
 EXTERN_C int Cns_aborttrans ();
 EXTERN_C int Cns_apiinit (struct Cns_api_thread_info **);
-EXTERN_C int Cns_chclass (const char *, int, char *);
+EXTERN_C int Cns_chclass (const char *, int, const char *);
 EXTERN_C int Cns_chdir (const char *);
 EXTERN_C int Cns_chmod (const char *, mode_t);
 EXTERN_C int Cns_chown (const char *, uid_t, gid_t);

ns/Cns_chclass.c

@@ -16,7 +16,7 @@
 #include "serrno.h"
 
 int
-Cns_chclass(const char *path, int classid, char *class_name)
+Cns_chclass(const char *path, int classid, const char *class_name)
 {
   char *actual_path;
   int c;

ns/Cns_chclass.man

@@ -11,7 +11,7 @@ Cns_chclass \- change class of a CASTOR directory in the name server
 .sp
 .BI "int Cns_chclass (const char *" path ,
 .BI "int " classid ,
-.BI "char *" class_name )
+.BI "const char *" class_name )
 .SH DESCRIPTION
 .B Cns_chclass
 changes the class of a CASTOR directory or file in the name server.