oeqa/core/case: fix typo on comment about exception name

(From OE-Core rev: 943a2a30e84660b412df4f1d60fb7e2e46764c50)

Signed-off-by: Leonardo Sandoval <leonardo.sandoval.gonzalez@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

meta/lib/oeqa/core/case.py

@@ -23,7 +23,7 @@ class OETestCase(unittest.TestCase):
 
     # td_vars has the variables needed by a test class
     # or test case instance, if some var isn't into td a
-    # OEMissingVariable exception is raised
+    # OEQAMissingVariable exception is raised
     td_vars = None
 
     @classmethod