Merge #6: Fixes typo

2953978 Fixes typo (Dimitris Tsapakidis)

Pull request description:

  “of of” -> “of”

  Mirroring downstream change committed in
  bitcoin@0a5a6b9

Tree-SHA512: 94a4d9e4fb49bdab06225fbed466eb3e29d1f4692920c91b33b499ac5545bf68e12e8d50f1db2730afe8d8a72ebeb9fbbedeb3e9fe93276735704e652e823e5b

Author: sipa

db/version_set.h

@@ -376,7 +376,7 @@ class Compaction {
   // Each compaction reads inputs from "level_" and "level_+1"
   std::vector<FileMetaData*> inputs_[2];      // The two sets of inputs
 
-  // State used to check for number of of overlapping grandparent files
+  // State used to check for number of overlapping grandparent files
   // (parent == level_ + 1, grandparent == level_ + 2)
   std::vector<FileMetaData*> grandparents_;
   size_t grandparent_index_;  // Index in grandparent_starts_