Trivial: remove extra character from comment

src/merkleblock.cpp

@@ -65,7 +65,7 @@ uint256 CPartialMerkleTree::CalcHash(int height, unsigned int pos, const std::ve
     } else {
         // calculate left hash
         uint256 left = CalcHash(height-1, pos*2, vTxid), right;
-        // calculate right hash if not beyond the end of the array - copy left hash otherwise1
+        // calculate right hash if not beyond the end of the array - copy left hash otherwise
         if (pos*2+1 < CalcTreeWidth(height-1))
             right = CalcHash(height-1, pos*2+1, vTxid);
         else