Fix build errors.

Author: JasonGowthorpe

hyper/tls.py

@@ -103,7 +103,7 @@ def init_context(cert_path=None, cert=None, cert_password=None):
                   "ensure the default cert.pem file is included in the " +
                   "distribution or provide a custom certificate when " +
                   "creating the connection.")
-        raise MissingCertFile(errMsg)
+        raise MissingCertFile(err_msg)
 
     context = ssl.SSLContext(ssl.PROTOCOL_SSLv23)
     context.set_default_verify_paths()

test/test_SSLContext.py

@@ -66,7 +66,7 @@ def test_missing_certs(self):
         succeeded = False
         threw_expected_exception = False
         try:
-            conn = hyper.tls.init_context(MISSING_PEM_FILE)
+            hyper.tls.init_context(MISSING_PEM_FILE)
             succeeded = True
         except hyper.common.exceptions.MissingCertFile:
             threw_expected_exception = True