Bugfix & Memory leak fix

[turtleizzy]

There is a bug in __alloc_gpu (https://github.com/lkoshale/DA_STAR/blob/f17db9039e393f7b67956df51c579790bbd33f23/include/a_star.cu#L72C1-L72C40) rendering all sssp with starting node other than 0 fail to proceed.

Adding gpuErrchk ( cudaMemcpy(d_PQ,PQ,sizeof(unsigned int)*N,cudaMemcpyHostToDevice) ); in __alloc_gpu should fix this issue.

By the way, several cudaFree and free should be added to address device & host memory leaks.

Refer to master...turtleizzy:DA_STAR:master . Several api-breaking features have been added in my fork making it difficult to submit a PR directly from my fork.

[lkoshale]

Hi @turtleizzy, thank you! for going through the code and finding and fixing the bugs.
Can you create a separate branch with your changes and then create pull request to the master?

PS: I have sent you the invitation to access to the repository.