scripts/runfvp: fix exception handling

Returning from the finally block at the end of the start_fvp() function
is discarding exceptions. Since start_fvp() is near to the top off the
call tree, this hides uncaught exceptions thrown by most of the code,
which makes detecting and debugging issues hard.

This is resolved by removing the return statement from the finally
block, allowing exceptions to propagate normally.

Signed-off-by: Gyorgy Szing <gyorgy.szing@arm.com>
Signed-off-by: Jon Mason <jon.mason@arm.com>

scripts/runfvp

@@ -86,8 +86,9 @@ def start_fvp(args, fvpconf, extra_args):
     except FileNotFoundError as e:
         logger.error(f"FVP executable not found ({e})")
     finally:
-        return fvp.stop()
+        rv=fvp.stop()
 
+    return rv
 
 def runfvp(cli_args):
     args, extra_args = parse_args(cli_args)