RFR: JDK-8261167: print_process_memory_info add a close call after fopen

[David Holmes]

On Thu, 4 Feb 2021 16:54:57 GMT, Matthias Baesken <mbaesken at openjdk.org> wrote:

> Hello, there is an fopen call opening "proc/self/status" in print_process_memory_info in os_linux.cpp. This call should also have a corresponding fclose-call.
> 
> See also the Sonar finding ("Opened stream never closed. Potential resource leak") :
> https://sonarcloud.io/project/issues?id=shipilev_jdk&open=AXck8BNvBBG2CXpcnaeA&resolved=false&severities=BLOCKER&types=BUG

Changes requested by dholmes (Reviewer).

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PR: https://git.openjdk.java.net/jdk/pull/2409