In gp_file_set_data_and_size free file->data only if allocated

[Sija]

I've stumbled upon (what I think is) a bug, where I cannot use gp_file_set_data_and_size for newly created instances because of: pointer being freed was not allocated

[ndim]

Isn't callingfree(NULL) supposed to be a no-op? On what operating system and C library is that?

[Sija]

You're right, I think the error stems from the fact that libgphoto is trying to release the memory it doesn't own (set in gp_file_set_data_and_size)