Make pointer NULL after free(...->semptr).

[drbitboy]

ImageStreamIO/ImageStreamIO.c

Line 1563 in d6f9c28

free(image->semptr);

See issue title.

[sanfords]

Absolutely. Always. Without a doubt.

[DasVinch]

Thanks for catching this.
Absolutely, we've been trying to clean memory init and deinit recently too.
@drbitboy feel free to push a PR.