tracing: Have the historgram use the result of str_has_prefix() for len of prefix
As str_has_prefix() returns the length on match, we can use that for the updating of the string pointer instead of recalculating the prefix size. Cc: Tom Zanussi <zanussi@kernel.org> Acked-by: Namhyung Kim <namhyung@kernel.org> Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
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