Fix for DecrementalRestorer fails to close sqlite file descriptor

DecrementalRestorer does not use sqlite3_finalize() on sqlite
statements after all statements are processed using sqlite3_step().
Calling sqlite3_close() without doing a sqlite_finalize(statement)
is causing failure in closing sqlite file descriptor. This patch
adds sqlite3_finalize() statements before doing close().

Change-Id: I39c1f28b058f5078537fcb9a228b449f2af033e6
Reviewed-on: http://review.couchbase.org/12267
Tested-by: Chiyoung Seo <chiyoung.seo@gmail.com>
Reviewed-by: Chiyoung Seo <chiyoung.seo@gmail.com>

restore_impl.cc

@@ -101,6 +101,7 @@ class DecrementalRestorer {
      */
     ~DecrementalRestorer() {
         if (db != NULL) {
+            (void)sqlite3_finalize(statement);
             (void)sqlite3_close(db);
         }
     }
@@ -143,6 +144,7 @@ class DecrementalRestorer {
         if (sqlite3_prepare_v2(db, query,
                                strlen(query),
                                &statement, NULL) != SQLITE_OK) {
+            (void)sqlite3_finalize(statement);
             (void)sqlite3_close(db);
             db = NULL;
             throw std::string("Failed to prepare statement");
@@ -161,6 +163,7 @@ class DecrementalRestorer {
             }
         }
 
+        (void)sqlite3_finalize(statement);
         (void)sqlite3_close(db);
         db = NULL;
     }