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m68k: fpu: frestore with NULL state should reset FPU state
Description of problem:
According to the PRM:
```
Floating-Point Status Register: Cleared if the state size is NULL; otherwise, not affected.
```
But this does not currently happen.
Steps to reproduce:
1. set a value in fpsr
2. do frestore with state size zero
3. read back fpsr and notice it isn't zero.
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