bugfix

YYWebImage/Cache/YYKVStorage.m

@@ -716,8 +716,8 @@ static UIApplication *_YYSharedApplication() {
         if (![self _dbOpen] || ![self _dbInitialize]) {
             [self _dbClose];
             NSLog(@"YYKVStorage init error: fail to open sqlite db.");
+            return nil;
         }
-        return nil;
     }
     [self _fileEmptyTrashInBackground]; // empty the trash if failed at last time
     return self;