Make return of ssh_get_error() const.

git-svn-id: svn+ssh://svn.berlios.de/svnroot/repos/libssh/trunk@403 7dcaeef0-15fb-0310-b436-a5af3365683c

include/libssh/libssh.h

@@ -151,7 +151,7 @@ typedef int socket_t;
 #define SSH_ERROR -1 /* error of some kind */
 #define SSH_AGAIN 1  /* the nonblocking call must be repeated */
 
-char *ssh_get_error(void *error); 
+const char *ssh_get_error(void *error); 
 int ssh_get_error_code(void *error);
 
 /* version checks */

libssh/error.c

@@ -49,7 +49,7 @@ void ssh_set_error(void *error, int code, const char *descr, ...) {
  * \param error the ssh session pointer
  * \return a static string describing the error
  */
-char *ssh_get_error(void *error){
+const char *ssh_get_error(void *error){
     struct error_struct *err=error;
     return err->error_buffer;
 }