egl: fix error string for dri2_create_image_dma_buf()
Using dri2_create_image_khr_texture_error() here prints an error like so:
command: eglCreateImageKHR, error: EGL_BAD_ALLOC (0x3003), message: "dri2_create_image_khr_texture"
This is confusing, because dri2_create_image_khr_texture() is unrelated to this error.
Instead, print a more accurate error manually.
Signed-off-by: Simon Ser contact@emersion.fr