Description of problem:
Before updating to nagios-plugins-disk-2.2.1-17.20190829gitfb792ff.el6.x86_64, the check_disk plugin output looked like:
# /usr/lib64/nagios/plugins/check_disk -w 20% -c 10% -l -e -M -X nfsd

DISK OK| /dev/mapper/vg_fileserver-lv_root=1343MB;1560;1755;0;1951 /dev/vda1=125MB;151;170;0;189 /dev/mapper/luks-d5ca124b-2525-49ed-adff-db1deb93bbb2=5305MB;7206;8107;0;9008

It now has multiple "dfree units" lines before the normal output:
# /usr/lib64/nagios/plugins/check_disk -w 20% -c 10% -l -e -M -X nfsd
dfree_units 0 0
disk_result is 0dfree_units 0 0
disk_result is 0dfree_units 0 0
disk_result is 0dfree_units 0 0
disk_result is 0DISK OK| /dev/mapper/vg_fileserver-lv_root=1345MiB;1560;1755;0;1951 tmpfs=0MiB;296;333;0;371 /dev/vda1=125MiB;151;170;0;189 /dev/mapper/luks-d5ca124b-2525-49ed-adff-db1deb93bbb2=5305MiB;7206;8107;0;9008

This causes the nagios console to only show "dfree_units 0 0" in service status, instead of the disk info.  This is also present on 7 after updating to nagios-plugins-disk-2.2.1-17.20190829gitfb792ff.el7.x86_64 there.  


Version-Release number of selected component (if applicable):
nagios-plugins-disk-2.2.1-17.20190829gitfb792ff.el6.x86_64
nagios-plugins-disk-2.2.1-17.20190829gitfb792ff.el7.x86_64

How reproducible:
always

Steps to Reproduce:
1. Run /usr/lib64/nagios/plugins/check_disk -w 20% -c 10%

Actual results:
Output has multiple dfree_units lines at start.

Expected results:
Output begins with DISK OK and stats.

Additional info:
Tested on CentOS 6 and 7 with epel.