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Binbin authored
When `/proc/sys/vm/overcommit_memory` is inaccessible, fp is NULL. `checkOvercommit` will return -1 without setting err_msg, and then the err_msg is used to print the log, crash the server. Set the err_msg variables to Null when declaring it, seems safer. And the overcommit_memory error log will print two "WARNING", like `WARNING WARNING overcommit_memory is set to 0!`, this PR also removes the second WARNING in `checkOvercommit`. Reported in #10846. Fixes #10846. Introduced in #10636 (7.0.1)
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