[Patch,AVR]: Fix typo in tc-avr.c

[Georg-Johann Lay]

This patch fixes a typo introduced with the changes for PR13503 that leads to
error if hhi8 is used.

Johann

gas/
	PR 13503
	* config/tc-avr.c (exp_mod): Fix typo introduced in 1.82
	from 2012-05-16.
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