[PATCH] correct off-by-one error in handling of precision of negative numbers (PR 78910)

[Martin Sebor]

The attached patch corrects an off-by-one mistake in handling
non-zero precisions in signed conversions (%d and %i) with
negative arguments, such as in sprintf(d, "%.2", -1).  The call
which results in the three bytes "-01" on output, not 2.  I.e.,
the minus sign must be taken into consideration.

Thanks
Martin
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