[monitoring-plugins] Use proper functions for absolute values

[RincewindsHat]

 Module: monitoring-plugins
 Branch: check_disk-compiler_warnings
 Commit: f810e02a458f6ee70db3e44562ae7ee561848646
 Author: RincewindsHat <12514511+RincewindsHat at users.noreply.github.com>
   Date: Sat Mar 26 15:09:39 2022 +0100
    URL: https://www.monitoring-plugins.org/repositories/monitoring-plugins/commit/?id=f810e02

Use proper functions for absolute values

---

 plugins/check_disk.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/plugins/check_disk.c b/plugins/check_disk.c
index 10768f8..75d5486 100644
--- a/plugins/check_disk.c
+++ b/plugins/check_disk.c
@@ -368,10 +368,10 @@ main (int argc, char **argv)
         critical_high_tide = UINT64_MAX;
 
         if (path->freeinodes_percent->warning != NULL) {
-          warning_high_tide = llabs( min( (double) warning_high_tide, (double) (1.0 - path->freeinodes_percent->warning->end/100)*path->inodes_total ));
+          warning_high_tide = (uint64_t) fabs( min( (double) warning_high_tide, (double) (1.0 - path->freeinodes_percent->warning->end/100)*path->inodes_total ));
         }
         if (path->freeinodes_percent->critical != NULL) {
-          critical_high_tide = llabs( min( (double) critical_high_tide, (double) (1.0 - path->freeinodes_percent->critical->end/100)*path->inodes_total ));
+          critical_high_tide = (uint64_t) fabs( min( (double) critical_high_tide, (double) (1.0 - path->freeinodes_percent->critical->end/100)*path->inodes_total ));
         }
 
         xasprintf (&perf_ilabel, "%s (inodes)", (!strcmp(me->me_mountdir, "none") || display_mntp) ? me->me_devname : me->me_mountdir);