Fix UB in hash-library (seladb#1241)

Fix https://oss-fuzz.com/testcase-detail/5137689594429440
Apply stbrumme/hash-library#15

Author: sashashura

3rdParty/hash-library/md5.cpp

@@ -292,7 +292,7 @@ void MD5::processBuffer()
   if (paddedLength < BlockSize)
     addLength = m_buffer + paddedLength;
   else
-    addLength = extra + paddedLength - BlockSize;
+    addLength = extra + (paddedLength - BlockSize);
 
   // must be little endian
   *addLength++ = msgBits & 0xFF; msgBits >>= 8;