bpo-33021: Fix GCC 7 warning (-Wmaybe-uninitialized) in mmapmodule.c#6117
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Introduced in 4484f9d:
cpython/Modules/mmapmodule.c: In function ‘new_mmap_object’:
cpython/Modules/mmapmodule.c:1126:18: warning: ‘fstat_result’ may be used uninitialized in this function [-Wmaybe-uninitialized]
if (fd != -1 && fstat_result == 0 && S_ISREG(status.st_mode)) {
https://bugs.python.org/issue33021