Gas Optimizations

[code423n4]

Usage of non-equal operator against zero consumes more gas

The contract : https://github.com/code-423n4/2022-06-connext/blob/main/contracts/contracts/core/connext/helpers/LPToken.sol at line 35
checks if the amount isn't 0 " require(amount != 0, "LPToken: cannot mint 0");
" , this likely consumes more gas while it can do the same work by making the higher-than operator

Consider using :

require(amount>0, "LPToken: cannot mint 0");

instead of

require(amount != 0, "LPToken: cannot mint 0");

[liu-zhipeng]

Invalid
See #274