fuzz: Remove Caddyfile adapter from fuzz corpus (#2925)

The Caddyfile adapter does not need to be fuzzed, as all it really does
is invoke the Caddyfile parser, which is already fuzzed

azure-pipelines.yml

@@ -206,7 +206,6 @@ jobs:
 
   - bash: |
       declare -A fuzzers_funcs=(\
-        ["./caddyconfig/httpcaddyfile/adapter_fuzz.go"]="FuzzHTTPCaddyfileAdapter" \
         ["./caddyconfig/httpcaddyfile/addresses_fuzz.go"]="FuzzParseAddress" \
         ["./caddyconfig/caddyfile/parse_fuzz.go"]="FuzzParseCaddyfile" \
         ["./listeners_fuzz.go"]="FuzzParseNetworkAddress" \
@@ -214,7 +213,6 @@ jobs:
       )
 
       declare -A fuzzers_targets=(\
-        ["./caddyconfig/httpcaddyfile/adapter_fuzz.go"]="caddyfile-adapter" \
         ["./caddyconfig/httpcaddyfile/addresses_fuzz.go"]="parse-address" \
         ["./caddyconfig/caddyfile/parse_fuzz.go"]="parse-caddyfile" \
         ["./listeners_fuzz.go"]="parse-network-address" \

caddyconfig/httpcaddyfile/adapter_fuzz.go

@@ -1,43 +0,0 @@
-// Copyright 2015 Matthew Holt and The Caddy Authors
-//
-// Licensed under the Apache License, Version 2.0 (the "License");
-// you may not use this file except in compliance with the License.
-// You may obtain a copy of the License at
-//
-//     http://www.apache.org/licenses/LICENSE-2.0
-//
-// Unless required by applicable law or agreed to in writing, software
-// distributed under the License is distributed on an "AS IS" BASIS,
-// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-// See the License for the specific language governing permissions and
-// limitations under the License.
-
-// +build gofuzz
-// +build gofuzz_libfuzzer
-
-package httpcaddyfile
-
-import (
-	"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
-)
-
-func FuzzHTTPCaddyfileAdapter(data []byte) int {
-	adapter := caddyfile.Adapter{
-		ServerType: ServerType{},
-	}
-
-	_, warns, err := adapter.Adapt(data, nil)
-
-	// Adapt func calls the Setup() func of the ServerType,
-	// thus it's going across multiple layers, each can
-	// return warnings or errors. Marking the presence of
-	// errors or warnings as interesting in this case
-	// could push the fuzzer towards a path where we only
-	// catch errors. Let's push the fuzzer to where it passes
-	// but breaks.
-	if err != nil || (warns != nil && len(warns) > 0) {
-		return 0
-	}
-
-	return 1
-}