Ensure we handle possible corruped data/frames.

We don't want to crash, and so if a frame as some invalid format
detected by invariant we want to properly report an invalid frame.

Part of S507-051.

Author: TurboGit

src/http2/aws-http2-frame.adb

@@ -178,6 +178,11 @@ package body AWS.HTTP2.Frame is
             raise Protocol_Error with
               Exception_Message (C_Protocol_Error, "invalid frame kind");
       end case;
+
+   exception
+      when others =>
+         raise Protocol_Error with
+           Exception_Message (C_Protocol_Error, "corruput frame");
    end Read;
 
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