fgragh: No need to invoke the function call_filter_check_discard()

The function call_filter_check_discard() has been removed in the
commit 49e4154f4b16 ("tracing: Remove TRACE_EVENT_FL_FILTERED logic"),
from another topic branch. But when merged together with commit
21e92806d39c6 ("function_graph: Support recording and printing the
function return address") which added another call to
call_filter_check_discard(), it caused the build to fail. Since the
function call_filter_check_discard() is useless, it can simply be removed
regardless of being merged with commit 49e4154f4b16 or not.

Link: https://lore.kernel.org/all/[email protected]/

Cc: Masami Hiramatsu <[email protected]>
Cc: Mathieu Desnoyers <[email protected]>
Cc: Donglin Peng <[email protected]>
Link: https://lore.kernel.org/[email protected]
Reported-by: Stephen Rothwell <[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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