[Resource Leak] Missing closing files in samples/bpf/hbm.c

Dear Kernel maintainers,

          1. In run_bpf_prog, the file opened at Line 308 may not closed when going to Line 310.
          Location: https://github.com/torvalds/linux/blob/5bfc75d92efd494db37f5c4c173d3639d4772966/samples/bpf/hbm.c#L302-L310

         2. In read_trace_pipe2, the file opened at Line 91 may not closed in the function.
         Location: https://github.com/torvalds/linux/blob/5bfc75d92efd494db37f5c4c173d3639d4772966/samples/bpf/hbm.c#L91-L109

           Should it be a bug? I can send a patch for these.

Best,
Ryan