Blob DB: Fix release build

Summary:
`compression` shadow the method name in `BlobFile`. Rename it.
Closes https://github.com/facebook/rocksdb/pull/3148

Differential Revision: D6274498

Pulled By: yiwu-arbug

fbshipit-source-id: 7d293596530998b23b6b8a8940f983f9b6343a98

utilities/blob_db/blob_file.h

@@ -178,8 +178,8 @@ class BlobFile {
 
   CompressionType compression() const { return compression_; }
 
-  void SetCompression(CompressionType compression) {
-    compression_ = compression;
+  void SetCompression(CompressionType c) {
+    compression_ = c;
   }
 
   std::shared_ptr<Writer> GetWriter() const { return log_writer_; }