Don't defer an std.ip() failure to WS_Alloc'ate

At this point the workspace already overflowed so there's no point
making further progress to fail on the next workspace operation.

Incidentally, we are failing for an IP conversion, not an integer.

lib/libvmod_std/vmod_std_conversions.c

@@ -202,8 +202,7 @@ vmod_ip(VRT_CTX, struct VARGS(ip) *a)
 
 	p = WS_Alloc(ctx->ws, vsa_suckaddr_len);
 	if (p == NULL) {
-		VSLb(ctx->vsl, SLT_VCL_Error,
-		    "vmod std.ip(): insufficient workspace");
+		VRT_fail(ctx, "std.ip: insufficient workspace");
 		return (NULL);
 	}
 
@@ -217,7 +216,7 @@ vmod_ip(VRT_CTX, struct VARGS(ip) *a)
 	if (a->valid_fallback)
 		return (a->fallback);
 
-	VRT_fail(ctx, "std.integer: conversion failed");
+	VRT_fail(ctx, "std.ip: conversion failed");
 	return (NULL);
 }