Fix usage of starts_with()

starts_with() returns true, if the string starts with the argument
string. This matches with C++ 20 expectation. But this broke
existing usage. The existing usage should fail if path doesn't starts
with "/sys". So the correct replacement of old code should be
!starts_with().

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>

Author: spandruvada

src/thd_cdev_gen_sysfs.cpp

@@ -28,7 +28,7 @@
 int cthd_gen_sysfs_cdev::update() {
 	if (cdev_sysfs.exists()) {
 		std::string base_path = cdev_sysfs.get_base_path();
-		if (starts_with(base_path, "/sys")) {
+		if (!starts_with(base_path, "/sys")) {
 			thd_log_debug( "cthd_gen_sysfs_cdev::update: Invalid sysfs path or allowed path %s\n",
 					base_path.c_str());
 			return THD_ERROR;

src/thd_engine.cpp

@@ -1012,7 +1012,7 @@ int cthd_engine::user_add_sensor(std::string name, std::string path) {
 	if (path.empty())
 		thd_engine_mutex.unlock();
 
-	if (starts_with(path, "/sys/")) {
+	if (!starts_with(path, "/sys/")) {
 		thd_log_debug("Invalid path %s\n", path.c_str());
 		return THD_ERROR;
 	}

src/thd_engine_default.cpp

@@ -208,7 +208,7 @@ int cthd_engine_default::read_thermal_sensors() {
 					}
 					sensor_new = std::move(sensor_virt);
 				} else {
-					if (starts_with(sensor_config->path, "/sys/")) {
+					if (!starts_with(sensor_config->path, "/sys/")) {
 						thd_log_debug( "Invalid sysfs path or allowed path %s\n",
 								sensor_config->path.c_str());
 						continue;

src/thd_sensor.h

@@ -70,7 +70,7 @@ class cthd_sensor {
 	int set_threshold(int index, int temp);
 	;
 	void update_path(std::string str) {
-		if (starts_with(str, "/sys/")) {
+		if (!starts_with(str, "/sys/")) {
 			thd_log_debug("Invalid path %s\n", str.c_str());
 			return;
 		}