return init method

Author: Sega-Zero

FastImageCache/FastImageCache/FastImageCache/FICImageTable.m

@@ -233,6 +233,10 @@ - (instancetype)initWithFormat:(FICImageFormat *)imageFormat imageCache:(FICImag
     return self;
 }
 
+- (instancetype)init {
+    return [self initWithFormat:nil imageCache:nil];
+}
+
 - (void)dealloc {
     if (_fileDescriptor >= 0) {
         close(_fileDescriptor);