api.c: fix resource leak in cg_chmod_path()

Fix resource leak, reported by Coverity Tool:

CID 276160 (#1 of 1): Resource leak (RESOURCE_LEAK)10. leaked_handle:
Handle variable fd going out of scope leaks the handle.

In cg_chmod_path(), the file descriptor checks for fd > 0, Coverity
warns about the possibility of the file descriptor being 0, fix it by
changing the check from '0' -> '-1'.

Fixes: d569122 ("api.c: fix file open in cg_chmod_path()")
Signed-off-by: Kamalesh Babulal <kamalesh.babulal@oracle.com>
Signed-off-by: Tom Hromatka <tom.hromatka@oracle.com>

src/api.c

@@ -240,7 +240,7 @@ int cg_chmod_path(const char *path, mode_t mode, int owner_is_umask)
 			strerror(errno));
 	last_errno = errno;
 
-	if (fd > 0)
+	if (fd > -1)
 		close(fd);
 
 	return ECGOTHER;