Bugfix:ligical error

Author: deyouslamtec

sdk/src/sl_crc.cpp

@@ -74,7 +74,7 @@ namespace sl {namespace crc32 {
         sl_u8 index;
         sl_u8* pch;
         pch = (unsigned char*)input;
-        sl_u8 leftBytes = (4 - len) & 0x3;
+        sl_u8 leftBytes = 4 - (len & 0x3);
 
         for (i = 0; i < len; i++) {
             index = (unsigned char)(crc^*pch);