[PATCH] fix off-by-one mistake in -Warray-bounds for major bounds (PR 84079)

[Martin Sebor]

-Warray-bounds fails to trigger when taking the address of an element
of a multi-dimensional array at an index that's equal to the bound of
one of the higher dimensions of the array.  The attached simple patch
corrects this shortcoming.  I will commit it tomorrow unless there are
suggestions for changes.

Tested on x86_64-linux.

Martin
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