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[asan] Don't crash on fclose(NULL)

Authored by kubamracek on Nov 29 2017, 11:43 AM.

Description

[asan] Don't crash on fclose(NULL)

It's explicitly forbidden to call fclose with NULL, but at least on Darwin, this succeeds and doesn't segfault. To maintain binary compatibility, ASan should survice fclose(NULL) as well.

Differential Revision: https://reviews.llvm.org/D40053

llvm-svn: 319347

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