tls_handshake_tests.py: Fix expected server log

The TLS 1.2 ClientHello function does not return
at the end in case of parsing error. Thus adapt
the server expected log in case of too small
fragments.

Signed-off-by: Ronald Cron <ronald.cron@arm.com>

scripts/mbedtls_framework/tls_handshake_tests.py

diff --git a/scripts/mbedtls_framework/tls_handshake_tests.py b/scripts/mbedtls_framework/tls_handshake_tests.py
index 00f0fcd..5de9129 100644
--- a/scripts/mbedtls_framework/tls_handshake_tests.py
+++ b/scripts/mbedtls_framework/tls_handshake_tests.py
@@ -107,7 +107,7 @@
             'SSL - An invalid SSL record was received',
         ]
         if side == Side.SERVER:
-            wanted_patterns[0:0] = ['<= parse client hello']
+            wanted_patterns[0:0] = ['=> parse client hello']
         elif version == Version.TLS13:
             wanted_patterns[0:0] = ['=> ssl_tls13_process_server_hello']
     else: