Is there an something wrong with the value being returned to this function in MATLAB resulting in an-CodePudding

My code below should return a max_flow value of 7 for the given network but it returns 2. I am certain my error is confined to generating the paths from s to t as I have re-wriiten the program in c which I have more experience in. I have also printed out my residual graph to see whats going on which is obviously also incorrect. There shouldn't be negative integers within it for one thing.

 0     0     0     0     0     0
 0     0     0     0     0     0
 0     0     0     0     0     0
 0     0     0     0    -2     2
 0     0     0     2     0     6
 0     0     0    -2    -6     0

I have also verified its 7 by hand. Inside my main function in c I have used while (int sent = dfs(s, t, INF)) as the condition for my while loop but in MATLAB I figured the equivalent was while sent == dfs(s,t,INF). I think that this could be the problem but I cant find an alternative and don't know where the hole in my logic is. I know that MATLAB has a built in maxlow function but I wanted to build my own as a learning experience. I am using a depth first search to find paths from source to sink in my residual graph Flow. I would appreciate any pointers to mending this and also anything else you think should/could be improved

    function ff
    clear;