Merge bitcoin/bitcoin#30691: Fix maybe-uninitialized warning in IsSpe… #3010

Job	Run time
test each commit	0s
Win64 native, VS 2022	54m 51s
macOS 13 native, x86_64, no depends, sqlite only, gui	52m 5s
ASan + LSan + UBSan + integer, no depends, USDT	52m 9s
	2h 39m 5s

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