Fix error message (#6264)

Summary:
Fix an error message when CURRENT is not found.

Test plan (dev server)
```
make check
```
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6264

Differential Revision: D19300699

Pulled By: riversand963

fbshipit-source-id: 303fa206386a125960ecca1dbdeff07422690caf

db/c.cc

@@ -852,15 +852,15 @@ void rocksdb_delete_cf(
         Slice(key, keylen)));
 }
 
-void rocksdb_delete_range_cf(
-    rocksdb_t* db,
+void rocksdb_delete_range_cf(rocksdb_t* db,
                              const rocksdb_writeoptions_t* options,
                              rocksdb_column_family_handle_t* column_family,
                              const char* start_key, size_t start_key_len,
                              const char* end_key, size_t end_key_len,
                              char** errptr) {
   SaveError(errptr, db->rep->DeleteRange(options->rep, column_family->rep,
-        Slice(start_key, start_key_len), Slice(end_key, end_key_len)));
+                                         Slice(start_key, start_key_len),
+                                         Slice(end_key, end_key_len)));
 }
 
 void rocksdb_merge(

db/c_test.c

@@ -1265,7 +1265,8 @@ int main(int argc, char** argv) {
     rocksdb_delete_cf(db, woptions, handles[1], "foo", 3, &err);
     CheckNoError(err);
 
-    rocksdb_delete_range_cf(db, woptions, handles[1], "foobar2", 7, "foobar4", 7, &err);
+    rocksdb_delete_range_cf(db, woptions, handles[1], "foobar2", 7, "foobar4",
+                            7, &err);
     CheckNoError(err);
 
     CheckGetCF(db, roptions, handles[1], "foo", NULL);

db/db_impl/db_impl_open.cc

@@ -363,7 +363,8 @@ Status DBImpl::Recover(
       return s;
     }
 
-    s = env_->FileExists(CurrentFileName(dbname_));
+    std::string current_fname = CurrentFileName(dbname_);
+    s = env_->FileExists(current_fname);
     if (s.IsNotFound()) {
       if (immutable_db_options_.create_if_missing) {
         // Has to be called only after Identity File creation is successful
@@ -376,7 +377,7 @@ Status DBImpl::Recover(
         }
       } else {
         return Status::InvalidArgument(
-            dbname_, "does not exist (create_if_missing is false)");
+            current_fname, "does not exist (create_if_missing is false)");
       }
     } else if (s.ok()) {
       if (immutable_db_options_.error_if_exists) {
@@ -394,14 +395,14 @@ Status DBImpl::Recover(
       FileOptions customized_fs(file_options_);
       customized_fs.use_direct_reads |=
           immutable_db_options_.use_direct_io_for_flush_and_compaction;
-      s = fs_->NewRandomAccessFile(CurrentFileName(dbname_), customized_fs,
-                                   &idfile, nullptr);
+      s = fs_->NewRandomAccessFile(current_fname, customized_fs, &idfile,
+                                   nullptr);
       if (!s.ok()) {
         std::string error_str = s.ToString();
         // Check if unsupported Direct I/O is the root cause
         customized_fs.use_direct_reads = false;
-        s = fs_->NewRandomAccessFile(CurrentFileName(dbname_), customized_fs,
-                                     &idfile, nullptr);
+        s = fs_->NewRandomAccessFile(current_fname, customized_fs, &idfile,
+                                     nullptr);
         if (s.ok()) {
           return Status::InvalidArgument(
               "Direct I/O is not supported by the specified DB.");

include/rocksdb/c.h

@@ -269,9 +269,8 @@ extern ROCKSDB_LIBRARY_API void rocksdb_delete_cf(
 
 extern ROCKSDB_LIBRARY_API void rocksdb_delete_range_cf(
     rocksdb_t* db, const rocksdb_writeoptions_t* options,
-    rocksdb_column_family_handle_t* column_family,
-    const char* start_key, size_t start_key_len,
-    const char* end_key, size_t end_key_len,
+    rocksdb_column_family_handle_t* column_family, const char* start_key,
+    size_t start_key_len, const char* end_key, size_t end_key_len,
     char** errptr);
 
 extern ROCKSDB_LIBRARY_API void rocksdb_merge(