Ensure (de)compressor is always closed.

Minor cleanup of a few missing calls to Close() on decompressor and
compressor instances.

R=maruel@chromium.org, mcgreevy@chromium.org, tandrii@chromium.org
BUG=

Review-Url: https://codereview.chromium.org/2884413002

common/isolatedclient/isolatedclient.go

diff --git a/common/isolatedclient/isolatedclient.go b/common/isolatedclient/isolatedclient.go
index 50325f5..462da9c 100644
--- a/common/isolatedclient/isolatedclient.go
+++ b/common/isolatedclient/isolatedclient.go
@@ -349,6 +349,7 @@
 		}
 		buf := make([]byte, 4096)
 		if _, err := io.CopyBuffer(compressor, src, buf); err != nil {
+			compressor.Close()
 			pw.CloseWithError(err)
 			return
 		}

common/isolatedclient/isolatedfake/isolatedfake.go

diff --git a/common/isolatedclient/isolatedfake/isolatedfake.go b/common/isolatedclient/isolatedfake/isolatedfake.go
index 5fccb6c..3813871 100644
--- a/common/isolatedclient/isolatedfake/isolatedfake.go
+++ b/common/isolatedclient/isolatedfake/isolatedfake.go
@@ -193,6 +193,7 @@
 		server.Fail(err)
 		return
 	}
+	defer decompressor.Close()
 	raw, err := ioutil.ReadAll(decompressor)
 	if err != nil {
 		w.WriteHeader(500)
@@ -273,6 +274,7 @@
 		server.Fail(err)
 		return map[string]string{"err": err.Error()}
 	}
+	defer decompressor.Close()
 	raw, err := ioutil.ReadAll(decompressor)
 	if err != nil {
 		server.Fail(err)