Constify

bin/varnishd/cache_backend.h

@@ -147,7 +147,7 @@ void VBE_DropRefLocked(struct backend *b);
 /* cache_backend_poll.c */
 void VBP_Insert(struct backend *b, struct vrt_backend_probe const *p, const char *hosthdr);
 void VBP_Remove(struct backend *b, struct vrt_backend_probe const *p);
-void VBP_Use(struct backend *b, const struct vrt_backend_probe const *p);
+void VBP_Use(const struct backend *b, const struct vrt_backend_probe const *p);
 
 /* Init functions for directors */
 typedef void dir_init_f(struct cli *, struct director **, int , const void*);

bin/varnishd/cache_backend_poll.c

@@ -510,7 +510,7 @@ VBP_Insert(struct backend *b, const struct vrt_backend_probe *p, const char *hos
 }
 
 void
-VBP_Use(struct backend *b, const struct vrt_backend_probe *p)
+VBP_Use(const struct backend *b, const struct vrt_backend_probe *p)
 {
 	struct vbp_target *vt;
 	struct vbp_vcl *vcl;