kernel: tracing/histograms: Fix memory leak problem

In the Linux kernel, the following vulnerability has been resolved: tracing/histograms: Fix memory leak problem This reverts commit 46bbe5c671e06f070428b9be142cc4ee5cedebac. As commit 46bbe5c671e0 "tracing: fix double free" said, the "double free" problem reported by clang static analyzer is: In...