nit changes

Author: krishnamd-jkp

google-api-go-generator/gen.go

@@ -2284,9 +2284,10 @@ func (meth *Method) generateCode() {
 		comment = "Set auto checksum in case of a single chunk upload if enabled."
 		p("%s", asComment("", comment))
 		pn("if c.object != nil &&")
+		pn(`	c.object.Crc32c == "" &&`)
 		pn("	c.mediaInfo_ != nil &&")
-		pn("	c.mediaInfo_.ChecksumEnabled() &&")
-		pn(`	c.mediaInfo_.UploadType() == "multipart" {`)
+		pn(`	c.mediaInfo_.UploadType() == "multipart" &&`)
+		pn("	c.mediaInfo_.ChecksumEnabled() {")
 		pn("	c.object.Crc32c = c.mediaInfo_.GetAutoChecksum()")
 		pn("}")
 	}

internal/gensupport/media.go

@@ -198,8 +198,7 @@ func (mi *MediaInfo) UploadType() string {
 	return "resumable"
 }
 
-// ChecksumEnabled returns true if both buffering is used and
-// enableAutoChecksum flag is set to true.
+// ChecksumEnabled returns if auto checksum is enabled in buffer.
 func (mi *MediaInfo) ChecksumEnabled() bool {
 	return mi.buffer != nil && mi.buffer.enableAutoChecksum
 }