'ret' in __ftrace_function_set_filter() may be used uninitialized if 're_count' is zero. Fix this to avoid a compiler warning. Change-Id: I0a257159141d86d92573c28d233a3653e89c48ea Signed-off-by: Matt Wagantall <mattw@codeaurora.org> (cherry picked from commit 212806984abf1c19d56f5c0c0e72e38a318851e1)