ftrace: Return EINVAL when writing invalid val to set_ftrace_filter
Currently it doesn't warn user on invald value: # echo nonexist_symbol > set_ftrace_filter or: # echo 'nonexist_symbol:mod:fuse' > set_ftrace_filter Better make it return failure. Signed-off-by: NLi Zefan <lizf@cn.fujitsu.com> Acked-by: NSteven Rostedt <rostedt@goodmis.org> LKML-Reference: <4B1DC4BF.2070003@cn.fujitsu.com> Signed-off-by: NFrederic Weisbecker <fweisbec@gmail.com>
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