ssl: fix SSLSocket#sysread leaking locktmp String on timeout #1292

Job	Run time
openssl-1.0.2u	52s
openssl-1.1.0l	54s
openssl-1.1.1w	55s
openssl-3.0.15	1m 4s
openssl-3.1.7	58s
openssl-3.2.3	57s
openssl-3.3.2	1m 2s
openssl-3.4.0	56s
openssl-master	3m 54s
libressl-3.1.5	52s
libressl-3.2.7	59s
libressl-3.3.6	59s
libressl-3.4.3	59s
libressl-3.5.3	58s
libressl-3.6.3	1m 6s
libressl-3.7.3	55s
libressl-3.8.4	59s
libressl-3.9.2	57s
libressl-4.0.0	56s
openssl-3.0.15 with fips provider	50s
openssl-3.1.7 with fips provider	57s
openssl-3.2.3 with fips provider	49s
openssl-3.3.2 with fips provider	56s
openssl-3.4.0 with fips provider	52s
openssl-master with fips provider	3m 43s
openssl-3.4.0 without legacy provider	57s
ruby-versions / Generate Ruby versions	2s
ubuntu-22.04 2.7	1m 5s
ubuntu-22.04 3.0	55s
ubuntu-22.04 3.1	1m 7s
ubuntu-22.04 3.2	1m 3s
ubuntu-22.04 3.3	57s
ubuntu-22.04 head	57s
ubuntu-22.04 truffleruby	1m 37s
ubuntu-22.04 truffleruby-head	1m 51s
ubuntu-20.04 2.7	59s
ubuntu-20.04 3.0	55s
ubuntu-20.04 3.1	1m 0s
ubuntu-20.04 3.2	1m 1s
ubuntu-20.04 3.3	58s
ubuntu-20.04 head	58s
ubuntu-20.04 truffleruby	1m 29s
ubuntu-20.04 truffleruby-head	2m 36s
macos-latest 2.7	49s
macos-latest 3.0	35s
macos-latest 3.1	39s
macos-latest 3.2	34s
macos-latest 3.3	38s
macos-latest head	48s
macos-latest truffleruby	1m 0s
macos-latest truffleruby-head	1m 1s
windows-latest 2.7	5m 40s
windows-latest 3.0	4m 4s
windows-latest 3.1	4m 13s
windows-latest 3.2	4m 16s
windows-latest 3.3	5m 38s
windows-latest head	4m 25s
windows-latest ucrt	4m 24s
windows-latest mswin	3m 13s
	1h 31m 43s

Provide feedback