fix handling around unique_ptr releases

include/mbgl/storage/default/shared_request_base.hpp

@@ -34,7 +34,7 @@ public:
         MBGL_VERIFY_THREAD(tid);
 
         if (source) {
-            source->notify(this, observers, std::shared_ptr<const Response>(response.release()),
+            source->notify(this, observers, std::shared_ptr<const Response>(std::move(response)),
                            hint);
         }
     }

platform/darwin/image.mm

@@ -108,7 +108,6 @@ Image::Image(const std::string &source_data) {
         CFRelease(data);
         width = 0;
         height = 0;
-        img.release();
         return;
     }
 

platform/default/sqlite_cache.cpp

@@ -163,7 +163,7 @@ void SQLiteCache::createDatabase() {
             db->exec(sql);
         } catch (mapbox::sqlite::Exception &ex) {
             Log::Error(Event::Database, "Failed to create database: %s", ex.what());
-            db.release();
+            db.reset();
         }
     }
 }