src: fix crash in GetErrorSource() for invalid using syntax #6001

Job	Run time
Build slim tarball	2m 29s
collect-openssl-versions	5s
aarch64-linux: Cache V8 build	6s
aarch64-darwin: with shared libraries	30m 28s
x86_64-linux: with shared libraries	31m 48s
x86_64-darwin: with shared libraries	19m 42s
aarch64-linux: with shared openssl_3_5 (3.5.5)	25m 31s
aarch64-linux: with shared openssl_3 (3.0.19)	24m 38s
aarch64-linux: with shared openssl_3_6 (3.6.1)	25m 47s
aarch64-linux: with shared openssl_1_1 (1.1.1w)	25m 23s
aarch64-linux: with shared openssl_4_0 (4.0.0)	25m 6s
Build slim tarball	2m 29s
x86_64-darwin: with shared libraries	46m 14s
x86_64-linux: with shared libraries	31m 48s
aarch64-linux: Cache V8 build	6s
aarch64-darwin: with shared libraries	30m 28s
aarch64-linux: with shared openssl_4_0 (4.0.0)	25m 6s
aarch64-linux: with shared openssl_3 (3.0.19)	24m 38s
aarch64-linux: with shared openssl_1_1 (1.1.1w)	25m 23s
aarch64-linux: with shared openssl_3_5 (3.5.5)	25m 31s
aarch64-linux: with shared openssl_3_6 (3.6.1)	25m 47s
collect-openssl-versions	5s
	7h 28m 38s

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