STBImageResize: stbir_resize_uint8_generic Bad null Check

[gudenau]

Environment

• LWJGL version: 3.2.2, checked in Master as well
• LWJGL build #: Unknown
• Java version: 15
• Platform: Linux
• Module: stb

Description

The alloc_context pointer for stbir_resize_uint8_generic is being checked for null, even though the library itself passes NULL to the underlying function calls in stbir_resize_uint8.

stbir_resize_uint8: https://github.com/nothings/stb/blob/master/stb_image_resize.h#L2463
stbir_resize_uint8_generic: https://github.com/nothings/stb/blob/master/stb_image_resize.h#L2506

[Spasi]

Thank you @gudenau! The overloads with an explicit alloc_context parameter were generated by mistake. Removed now with 15cc62b.

Note that stb is already configured to use the LWJGL memory allocator internally, so a user-specified allocation context is not necessary.