auxdisplay: jhd1313: Out-of-bounds read

[thedjnK]

Describe the bug
There is an out of bounds read in the jhd1313 auxdisplay driver caused by checking a variable being greater than the array size of colours, when it should instead be greater than or equal.

Expected behavior
No out of bounds read

Impact
Undefined behaviour

Environment (please complete the following information):

• Commit SHA or Version used: v3.7-branch and v4.0-branch

[github-actions]

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