[Piglit] [RESEND RFC 19/25] gen_tess_input_tests.py: add missing docstring

[baker.dylan.c at gmail.com]

From: Dylan Baker <baker.dylan.c at gmail.com>

Signed-off-by: Dylan Baker <dylanx.c.baker at intel.com>
---
 generated_tests/gen_tess_input_tests.py | 1 +
 1 file changed, 1 insertion(+)

diff --git a/generated_tests/gen_tess_input_tests.py b/generated_tests/gen_tess_input_tests.py
index e0c2ac6..3149471 100644
--- a/generated_tests/gen_tess_input_tests.py
+++ b/generated_tests/gen_tess_input_tests.py
@@ -568,6 +568,7 @@ class TesTest(object):
 
 
 def all_tests():
+    """Generator yield test instances."""
     for type_name in ['float', 'vec2', 'vec3', 'vec4',
                       'mat2', 'mat3', 'mat4',
                       'mat2x3', 'mat2x4', 'mat3x2',
-- 
2.6.1