Fixing fprintf of non string literal

Summary:
sst_dump_tool contains two instances of `fprintf`s where the `format` argument is not
a string literal. This prevents the code from compiling with some compilers/compiler
options because of the potential security risks associated with printing non-literals.

Test Plan: make all

Reviewers: rven, igor, yhchiang, sdong, anthony

Reviewed By: anthony

Subscribers: dhruba, leveldb

Differential Revision: https://reviews.facebook.net/D43305

util/sst_dump_tool.cc

@@ -126,14 +126,14 @@ uint64_t SstFileReader::CalculateCompressedTableSize(
   unique_ptr<Iterator> iter(table_reader_->NewIterator(ReadOptions()));
   for (iter->SeekToFirst(); iter->Valid(); iter->Next()) {
     if (!iter->status().ok()) {
-      fprintf(stderr, iter->status().ToString().c_str());
+      fputs(iter->status().ToString().c_str(), stderr);
       exit(1);
     }
     table_builder_->Add(iter->key(), iter->value());
   }
   Status s = table_builder_->Finish();
   if (!s.ok()) {
-    fprintf(stderr, s.ToString().c_str());
+    fputs(s.ToString().c_str(), stderr);
     exit(1);
   }
   uint64_t size = table_builder_->FileSize();