access_dvb: constify.

modules/access/dvb/dvb.h

@@ -240,12 +240,12 @@ void en50221_SendMMIObject( access_t * p_access, int i_slot,
                                 en50221_mmi_object_t *p_object );
 void en50221_End( access_t * );
 
-char *dvbsi_to_utf8( char *psz_instring, size_t i_length );
+char *dvbsi_to_utf8( const char *psz_instring, size_t i_length );
 
 #ifdef ENABLE_HTTPD
 int HTTPOpen( access_t *p_access );
 void HTTPClose( access_t *p_access );
-char *HTTPExtractValue( char *psz_uri, const char *psz_name,
+char *HTTPExtractValue( const char *psz_uri, const char *psz_name,
                         char *psz_value, int i_value_max );
 #endif
 /*****************************************************************************

modules/access/dvb/en50221.c

@@ -2343,7 +2343,7 @@ static inline void *FixUTF8( char *p )
     return p;
 }
 
-char *dvbsi_to_utf8( char *psz_instring, size_t i_length )
+char *dvbsi_to_utf8( const char *psz_instring, size_t i_length )
 {
     const char *psz_encoding, *psz_stringstart;
     char *psz_outstring, *psz_tmp;

modules/access/dvb/http.c

@@ -300,7 +300,7 @@ static int HttpCallback( httpd_file_sys_t *p_args,
 /****************************************************************************
  * HTTPExtractValue: Extract a GET variable from psz_request
  ****************************************************************************/
-char *HTTPExtractValue( char *psz_uri, const char *psz_name,
+char *HTTPExtractValue( const char *psz_uri, const char *psz_name,
                         char *psz_value, int i_value_max )
 {
     char *p = psz_uri;