kselftest/cgroup: fix variable dereferenced before check warning

cg_name(const char *root, const char *name) is always called with
non-empty root and name arguments, so there is no sense in checking
it in the function body (after using in strlen()).

Signed-off-by: Roman Gushchin <[e-mail]>
Reported-by: Dan Carpenter <[e-mail]>
Signed-off-by: Shuah Khan (Samsung OSG) <[e-mail]>

tools/testing/selftests/cgroup/cgroup_util.c

···
 	size_t len = strlen(root) + strlen(name) + 2;
 	char *ret = malloc(len);
 
-	if (name)
-		snprintf(ret, len, "%s/%s", root, name);
+	snprintf(ret, len, "%s/%s", root, name);
 
 	return ret;
 }
···
 	size_t len = strlen(root) + strlen(name) + 10;
 	char *ret = malloc(len);
 
-	if (name)
-		snprintf(ret, len, "%s/%s_%d", root, name, index);
+	snprintf(ret, len, "%s/%s_%d", root, name, index);
 
 	return ret;
 }