kselftest: arm64: Fix exit code of sve-ptrace

We track if sve-ptrace encountered a failure in a variable but don't
actually use that value when we exit the program, do so.

Signed-off-by: Mark Brown <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Will Deacon <[email protected]>

tools/testing/selftests/arm64/fp/sve-ptrace.c

@@ -332,5 +332,5 @@ int main(void)
 
 	ksft_print_cnts();
 
-	return 0;
+	return ret;
 }