selftests/ftrace: Fix check of return value in fgraph-retval.tc test

The addition of recording both the function name and return address to the
function graph tracer updated the selftest to check for "=-5" from "= -5".
But this causes the test to fail on certain configs, as "= -5" is still a
value that can be returned if function addresses are not enabled (older kernels).

Check for both "=-5" and " -5" as a success value.

Cc: Masami Hiramatsu <[email protected]>
Cc: Mathieu Desnoyers <[email protected]>
Cc: Shuah Khan <[email protected]>
Cc: Donglin Peng <[email protected]>
Link: https://lore.kernel.org/[email protected]
Fixes: 21e92806d39c6 ("function_graph: Support recording and printing the function return address")
Signed-off-by: Steven Rostedt (Google) <[email protected]>

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