[patch,avr] Fix PR57844

[Georg-Johann Lay]

The problem with this PR is that -size is used as addend in
avr_prologue_setup_frame instead of truncating it to the mode of the operation.

Fix as obvious.

Ok for trunk and backport?

Johann


 	PR target/57844
	* config/avr/avr.c (avr_prologue_setup_frame): Trunk -size to mode
	of my_fp.
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