Fix ksym buffer overflow on i386 #1559

Job	Run time
Build and Lint	2m 27s
Build Documentation	14s
Run tests on previous stable Go	2m 3s
Run tests on arm64	40s
Run tests (Windows) (main)	3m 2s
Run tests (Linux) (mainline)	1m 22s
Run tests (Linux) (stable)	1m 20s
Run tests (Linux) (6.6)	1m 22s
Run tests (Linux) (6.1)	1m 17s
Run tests (Linux) (5.15)	1m 30s
Run tests (Linux) (5.10)	1m 28s
Run tests (Linux) (5.4)	1m 23s
Run tests (Linux) (4.19)	1m 42s
Run tests (Linux) (4.14)	2m 42s
Run tests (Linux) (4.9)	1m 32s
	24m 4s

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