meta-quanta: meta-gbs: Fix gbs-set-failsafe.sh

The busctl tree and grep used to get the number of zones is too wide and
the tree returns fans and sensors within the zone:

~# busctl tree xyz.openbmc_project.State.FanCtrl
`- /xyz
  `- /xyz/openbmc_project
    `- /xyz/openbmc_project/settings
      `- /xyz/openbmc_project/settings/fanctrl
        |- /xyz/openbmc_project/settings/fanctrl/zone0
        | |- /xyz/openbmc_project/settings/fanctrl/zone0/cputemp
	...
	...
        `- /xyz/openbmc_project/settings/fanctrl/zone1
          |- /xyz/openbmc_project/settings/fanctrl/zone1/nvme0
	  ...
	  ...

Which means running the grep gives more than the 2 zones that were meant
to be gotten resulting in trying to set the failsafe for many more
zones:

Jul 11 11:49:08 busctl[9642]: Failed to set property Target on interface xyz.openbmc_project.Control.FanSpeed: Unknown object '/xyz/openbmc_project/settings/fanctrl/zone4'.
Jul 11 11:49:09 busctl[9693]: Failed to set property Target on interface xyz.openbmc_project.Control.FanSpeed: Unknown object '/xyz/openbmc_project/settings/fanctrl/zone4'.
Jul 11 11:49:10 busctl[9744]: Failed to set property Target on interface xyz.openbmc_project.Control.FanSpeed: Unknown object '/xyz/openbmc_project/settings/fanctrl/zone4'.
Jul 11 11:49:11 busctl[9767]: Failed to set property Target on interface xyz.openbmc_project.Control.FanSpeed: Unknown object '/xyz/openbmc_project/settings/fanctrl/zone4'.
Jul 11 11:49:12 gbs-set-failsafe.sh[8710]: Failure setting zone4 fan failsafe to 255
...
...

Tested:
With the change, the grep correctly gives "2" as the number of zones:

~# busctl tree xyz.openbmc_project.State.FanCtrl | grep -c -E 'zone[0-9]$'
2

Signed-off-by: Brandon Kim <[email protected]>
Change-Id: I1efd09b8d99ec00027489a05b647b43b1186c038

Author: brandonkimbk

meta-quanta/meta-gbs/recipes-google/acpi-power-state/acpi-power-state-daemon/gbs-set-failsafe.sh

@@ -22,7 +22,7 @@ if [ -z "$target_pwm" ]; then
   exit 1
 fi
 
-zone_num="$(busctl tree xyz.openbmc_project.State.FanCtrl | grep -c zone)"
+zone_num="$(busctl tree xyz.openbmc_project.State.FanCtrl | grep -c -E 'zone[0-9]$')"
 result=0
 
 for (( i = 0; i < zone_num; i++ )); do