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update-menus: improve error checking for lock file open()

Topi Miettinen requested to merge topimiettinen-guest/menu:improve-lock-error-checking into master

Check return value of open()ing the lock file. This makes the error messages more precise.

Before: update-menus[24978]: Cannot lock /var/run/update-menus.pid: Bad file descriptor - Aborting.

After: update-menus[24980]: Cannot lock /var/run/update-menus.pid: Read-only file system - Aborting.

Signed-off-by: Topi Miettinen toiwoton@gmail.com

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