Dis5900asm: Fix an out of bounds access on invalid pmfhl formats #11963
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Description of Changes
Off by one issue fix when I originally fixed this in #9761
Rationale behind Changes
Fixes a crash when disassembling invalid PMFHL opcodes (or memory with the value 0x70003ff0)
Suggested Testing Steps
See if #11959 is fixed.
You can reproduce this by going into the memory view, right clicking and showing at 4 bytes. Enter 0x70003ff0 somewhere and take the disassembler to that memory area.