Fix get MAXIMUM_PACKET_SIZE byte error (#106) #794

Job	Run time
PHP8.0 Swoole-v4.8.13 Test on macOS	2m 37s
PHP8.0 Swoole-v4.8.13 Test on Linux	1m 34s
PHP8.0 Swoole-v5.1.5 Test on macOS	2m 27s
PHP8.0 Swoole-v5.1.5 Test on Linux	1m 35s
PHP8.1 Swoole-v4.8.13 Test on macOS	2m 27s
PHP8.1 Swoole-v4.8.13 Test on Linux	1m 32s
PHP8.1 Swoole-v5.1.5 Test on macOS	2m 45s
PHP8.1 Swoole-v5.1.5 Test on Linux	1m 45s
PHP8.1 Swoole-master Test on macOS	3m 14s
PHP8.1 Swoole-master Test on Linux	1m 42s
PHP8.2 Swoole-v4.8.13 Test on macOS	2m 43s
PHP8.2 Swoole-v4.8.13 Test on Linux	1m 30s
PHP8.2 Swoole-v5.1.5 Test on macOS	2m 28s
PHP8.2 Swoole-v5.1.5 Test on Linux	1m 38s
PHP8.2 Swoole-master Test on macOS	3m 2s
PHP8.2 Swoole-master Test on Linux	1m 49s
PHP8.3 Swoole-v5.1.5 Test on macOS	2m 34s
PHP8.3 Swoole-v5.1.5 Test on Linux	1m 34s
PHP8.3 Swoole-master Test on macOS	2m 57s
PHP8.3 Swoole-master Test on Linux	1m 48s
	43m 41s

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