Clean up use of 'iname' variable in generate_sequential_loop_dim_code (found by @mattwala)

test/test_loopy.py

@@ -1948,8 +1948,8 @@ def test_tight_loop_bounds_codegen():
 
     for_loop = \
         "for (int j = " \
-        "(lid(0) == 0 && gid(0) == 0 ? 0 : -2 + 10 * gid(0) + 2 * lid(0)); " \
-        "j <= (lid(0) == 0 && -1 + gid(0) == 0 ? 9 : 2 * lid(0)); ++j)"
+        "(gid(0) == 0 && lid(0) == 0 ? 0 : -2 + 2 * lid(0) + 10 * gid(0)); " \
+        "j <= (-1 + gid(0) == 0 && lid(0) == 0 ? 9 : 2 * lid(0)); ++j)"
 
     assert for_loop in cgr.device_code()