hipFree returns error code when 0/null-pointer is passed.

[briansp2020]

I don't know how common the practice is. But Udacity homework code calls cudaFree(0) before doing anything else and hipified version returns error code and cause the program to exit with an error. If this practice is common among CUDA software, hipFree should return success code and make it behave more like cudaFree. In C, calling free with 0/null-pointer does not cause error either.

See line 27 of https://github.com/udacity/cs344/blob/master/Problem%20Sets/Problem%20Set%201/HW1.cpp

[bensander]

Yes, calling hipFree with NULL pointer should initialize the runtime but not return an error. We will fix.

[mangupta]

This was fixed in hip 0.90. Calling hipFree(0) now initializes the runtime and returns hipSuccess.