Fix typo 'unsupoported' -> 'unsupported'

Signed-off-by: David Horstmann <david.horstmann@arm.com>
diff --git a/tests/data_files/test-ca.opensslconf b/tests/data_files/test-ca.opensslconf
index 3bb2379..b2c2fa1 100644
--- a/tests/data_files/test-ca.opensslconf
+++ b/tests/data_files/test-ca.opensslconf
@@ -18,7 +18,7 @@
 [nonprintable_othername_san]
 subjectAltName=otherName:1.3.6.1.5.5.7.8.4;SEQ:nonprintable_hw_module_name
 
-[unsupoported_othername_san]
+[unsupported_othername_san]
 subjectAltName=otherName:1.2.3.4;UTF8:some other identifier
 
 [dns_alt_names]