Neil Roberts fa0df6ea96 Fix freeing an atlas texture that hasn't been allocated
The free function for atlas textures was previously always assuming
that there will be a valid sub_texture pointer but this might not be
the case if the texture was never successfully allocated. This was
causing Cogl to crash if the application tries to make a texture that
can not fit in the atlas using the automagic texture API.

Reviewed-by: Robert Bragg <robert@linux.intel.com>

(cherry picked from commit a7a8b7aefc8cb03fe8b716bee06b3449a7dba85f)
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