test-cpu/gpufreq: fix tlp detection

Rationale: /usr/sbin/ may not be included in PATH, as in Debian.

Author: linrunner

unit-tests/test-cpufreq.sh

@@ -1066,10 +1066,7 @@ check_platform_profile () {
 }
 
 # check prerequisites and initialize
-cmd_exists "$TLP" || {
-    printf_msg "Error: %s not installed." "$TLP"
-    exit 254
-}
+check_tlp
 _cpu_driver=$(read_sysf "${CPU0}/cpufreq/scaling_driver") || {
     printf_msg "Error: could not determine cpu scaling driver."
     exit 128

unit-tests/test-func

@@ -34,9 +34,12 @@ cache_root_cred () {
     sudo true
 }
 
-cmd_exists () {
-    # test if command exists -- $1: command
-    command -v "$1" > /dev/null 2>&1
+check_tlp () {
+    # test if tlp installed
+    if [ ! -f /usr/sbin/tlp ]; then
+        printf_msg "Error: %s not installed." "$TLP" 1>&2
+        exit 254
+    fi
 }
 
 read_sysf () {

unit-tests/test-gpufreq.sh

@@ -401,12 +401,7 @@ check_amd_gpu_abm_level () {
 }
 
 # check prerequisites and initialize
-cmd_exists "$TLP" || {
-    printf_msg "Error: %s not installed." "$TLP"
-    exit 254
-}
-cache_root_cred
-
+check_tlp
 start_report
 
 # shellcheck disable=SC2034