fping: Update to version 5.4

fping: Update to version 5.4

- Update from version 5.3 to 5.4
- Update of rootfile not required
- Changelog
    5.4
     Bugfixes
	- Memory allocation safety checks for event storage (thanks David.A for bug report)
	- Fix off-by-one boundary check in seqmap code (thanks David.A for bug report)
	- The minimum value for the period (-p flag) is now 0.001 milliseconds,
	  since it probably never makes sense to use a smaller value, and to avoid doing
	  a very large memory allocation for event storage.

Signed-off-by: Adolf Belka <adolf.belka@ipfire.org>
Signed-off-by: Michael Tremer <michael.tremer@ipfire.org>