modify README

.gitattributes

@@ -1 +0,0 @@
-*.yar linguist-vendored

clamav.go

@@ -176,12 +176,8 @@ func (c *Clamav) EngineGetNum(field EngineField) (uint64, error) {
 
 // Free the memory allocated to clamav instance, Free should be called
 // when the engine is no longer in use.
-func (c *Clamav) Free() error {
-	ret := ErrorCode(C.cl_engine_free((*C.struct_cl_engine)(c.engine)))
-	if ret == CL_SUCCESS {
-		return nil
-	}
-	return Strerr(ret)
+func (c *Clamav) Free() int {
+	return int(C.cl_engine_free((*C.struct_cl_engine)(c.engine)))
 }
 
 // ScanMapCB scans custom data
@@ -202,7 +198,7 @@ func (c *Clamav) ScanMapCB(fmap *Fmap, fileName string, context interface{}) (ui
 	defer CloseMemory(fmap)
 	// clean
 	if ret == CL_SUCCESS {
-		return uint(scanned), "", nil
+		return 0, "", nil
 	}
 	// virus
 	if ret == CL_VIRUS {