adaptived: ftests: Fix freeing of invalid pointer in test 1003

Fix the following error in sudo test 1003:

	<snip>
	Debug: handle_special_properties: property=CPUQuota,
	value->value.str_value=44%, real property: CPUQuotaPerSecUSec
	Debug: handle_special_properties: sd_bus_message_append(m, (sv),
	CPUQuotaPerSecUSec, t, 440000
	Debug: adaptived main loop exceeded max loops
	free(): invalid pointer
	Aborted

Test 1003 was re-using the "len" variable and this was confusing
getline().  getline() was then re-using a buffer even though it wasn't
large enough, leading to a memory corruption.

Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>

adaptived/tests/ftests/1003-sudo-effect-sd_bus_setting-CPUQuota.c

@@ -44,9 +44,10 @@ static const int expected_period = 1000000;
 
 int main(int argc, char *argv[])
 {
-	char *cgrp_path = NULL, *cgrp_file = NULL;
+	char *cgrp_path = NULL;
 	char config_path[FILENAME_MAX];
 	char expected_buf[FILENAME_MAX];
+	char cgrp_file[FILENAME_MAX];
 	struct adaptived_ctx *ctx = NULL;
 	int ret, version, read_value;
 	FILE * fp;
@@ -88,10 +89,8 @@ int main(int argc, char *argv[])
 			goto err;
 
 		len = strlen(cgrp_path) + 1 + strlen("cpu.cfs_period_us") + 1;
-		cgrp_file = malloc(sizeof(char) * len);
-
-		memset(cgrp_file, 0, sizeof(char) * len);
 
+		memset(cgrp_file, 0, sizeof(cgrp_file));
 		sprintf(cgrp_file, "%s/cpu.cfs_period_us", cgrp_path);
 
 		fp = fopen(cgrp_file, "r");
@@ -110,8 +109,7 @@ int main(int argc, char *argv[])
 		if (read_value != expected_period)
 			goto err;
 
-		memset(cgrp_file, 0, sizeof(char) * len);
-
+		memset(cgrp_file, 0, sizeof(cgrp_file));
 		sprintf(cgrp_file, "%s/cpu.cfs_quota_us", cgrp_path);
 
 		fp = fopen(cgrp_file, "r");
@@ -137,10 +135,8 @@ int main(int argc, char *argv[])
 		sprintf(expected_buf, "%d %d\n", expected_quota, expected_period);
 
 		len = strlen(cgrp_path) + 1 + strlen("cpu.max") + 1;
-		cgrp_file = malloc(sizeof(char) * len);
-
-		memset(cgrp_file, 0, sizeof(char) * len);
 
+		memset(cgrp_file, 0, sizeof(cgrp_file));
 		sprintf(cgrp_file, "%s/cpu.max", cgrp_path);
 
 		fp = fopen(cgrp_file, "r");
@@ -162,8 +158,6 @@ int main(int argc, char *argv[])
 		free(line);
 	adaptived_release(&ctx);
 	stop_transient(cgroup_slice_name);
-	if (cgrp_file)
-		free(cgrp_file);
 	if (cgrp_path)
 		free(cgrp_path);
 
@@ -174,8 +168,6 @@ int main(int argc, char *argv[])
 		free(line);
 	adaptived_release(&ctx);
 	stop_transient(cgroup_slice_name);
-	if (cgrp_file)
-		free(cgrp_file);
 	if (cgrp_path)
 		free(cgrp_path);