cocci: Remove redundant AN() checks after REPLACE()

Except those present in varnishtest/vtest.

bin/varnishd/common/common_vsmw.c

@@ -246,7 +246,6 @@ vsmw_delseg(struct vsmw *vsmw, struct vsmwseg *seg)
 	} else {
 		vsmw_mkent(vsmw, vsmw->idx);
 		REPLACE(t, VSB_data(vsmw->vsb));
-		AN(t);
 		fd = openat(vsmw->vdirfd,
 		    t, O_WRONLY|O_CREAT|O_EXCL, vsmw->mode);
 		assert(fd >= 0);

bin/varnishd/mgt/mgt_symtab.c

@@ -137,7 +137,6 @@ mgt_vcl_import_vmod(struct vclprog *vp, const struct vjsn_val *vv)
 		ALLOC_OBJ(vf, VMODFILE_MAGIC);
 		AN(vf);
 		REPLACE(vf->fname, v_dst);
-		AN(vf->fname);
 		VTAILQ_INIT(&vf->vcls);
 		AZ(mgt_vcl_cache_vmod(v_name, v_file, v_dst));
 		VTAILQ_INSERT_TAIL(&vmodhead, vf, list);

bin/varnishncsa/varnishncsa.c

@@ -1122,7 +1122,6 @@ main(int argc, char * const *argv)
 			if (format != NULL)
 				VUT_Error(vut, 1, "Format already set");
 			REPLACE(format, optarg);
-			AN(format);
 			break;
 		case 'f':
 			if (format != NULL)

tools/coccinelle/replace.cocci

@@ -10,3 +10,10 @@ expression ptr, val;
 - ptr = strdup(val);
 - AN(ptr);
 + REPLACE(ptr, val);
+
+@@
+expression ptr, val;
+@@
+
+REPLACE(ptr, val);
+- AN(ptr);