include/rocksdb/utilities/env_librados: fix typo

Summary:
Broken by 972f96b3Signed-off-by: NSage Weil <sage@redhat.com>
Closes https://github.com/facebook/rocksdb/pull/1719

Differential Revision: D4366123

Pulled By: IslamAbdelRahman

fbshipit-source-id: a11e535

include/rocksdb/utilities/env_librados.h

@@ -71,7 +71,7 @@ class EnvLibrados : public EnvWrapper {
   //                  the calling process does not have permission to determine
   //                  whether this file exists, or if the path is invalid.
   //         IOError if an IO Error was encountered
-  Status FileExists(const std::string& fname) overrdie;
+  Status FileExists(const std::string& fname) override;
 
   // Store in *result the names of the children of the specified directory.
   // The names are relative to "dir".