reduce the amount of compiler warnings for variable shadowing

code/renderergl2/tr_model_iqm.c

@@ -206,7 +206,7 @@ qboolean R_LoadIQM( model_t *mod, void *buffer, int filesize, const char *mod_na
 	}
 	vertexarray = (iqmVertexArray_t *)((byte *)header + header->ofs_vertexarrays);
 	for( i = 0; i < header->num_vertexarrays; i++, vertexarray++ ) {
-		int	j, n, *intPtr;
+		int	n, *intPtr;
 
 		if( vertexarray->size <= 0 || vertexarray->size > 4 ) {
 			return qfalse;

code/renderergl2/tr_world.c

@@ -157,7 +157,6 @@ static int R_DlightSurface( msurface_t *surf, int dlightBits ) {
 	
 	if ( surf->cullinfo.type & CULLINFO_PLANE )
 	{
-		int i;
 		for ( i = 0 ; i < tr.refdef.num_dlights ; i++ ) {
 			if ( ! ( dlightBits & ( 1 << i ) ) ) {
 				continue;
@@ -238,7 +237,6 @@ static int R_PshadowSurface( msurface_t *surf, int pshadowBits ) {
 	
 	if ( surf->cullinfo.type & CULLINFO_PLANE )
 	{
-		int i;
 		for ( i = 0 ; i < tr.refdef.num_pshadows ; i++ ) {
 			if ( ! ( pshadowBits & ( 1 << i ) ) ) {
 				continue;