small cleanup to fsx.c

[macosforgebot]

kirk@… originally submitted this as ticket:14

• Owner: somebody
• Cc: krussell@…

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kirussel/portablefstools@master...kirussel/misc

I have proposed some changes that fixes the following:

• for msync(), uses MS_SYNC, instead of hard coding zero
• for mmap(), uses MAP_FAILED, instead of harding coding -1
• for getopt(), using -1, instead of EOF
• added "y" to the getopt string -- this is already implemented but is missing from the command line args

[macosforgebot]

kirk@… originally submitted this as attachment:misc_patch.txt:⁠ticket:14

• Attachment misc_patch.txt (1.4 KB) added

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patch