build failed using gcc 8.1.0

    make -j32

failed with the following error, looks like a trivial fix. just string formatting

pfmlib_perf_event_pmu.c: In function 'gen_tracepoint_table':
pfmlib_perf_event_pmu.c:349:36: error: '%s' directive output may be truncated writing up to 255 bytes into a region of size between 0 and 4095 [-Werror=format-truncation=]
   snprintf(d2path, MAXPATHLEN, "%s/%s", debugfs_mnt, d1->d_name);
                                    ^~
pfmlib_perf_event_pmu.c:349:3: note: 'snprintf' output between 2 and 4352 bytes into a destination of size 4096
   snprintf(d2path, MAXPATHLEN, "%s/%s", debugfs_mnt, d1->d_name);
   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
pfmlib_perf_event_pmu.c:399:58: error: '%s' directive output may be truncated writing up to 255 bytes into a region of size between 0 and 4095 [-Werror=format-truncation=]
                         snprintf(idpath, MAXPATHLEN, "%s/%s/id", d2path, d2->d_name);
                                                          ^~
pfmlib_perf_event_pmu.c:399:25: note: 'snprintf' output between 5 and 4355 bytes into a destination of size 4096
                         snprintf(idpath, MAXPATHLEN, "%s/%s/id", d2path, d2->d_name);
                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
cc1: all warnings being treated as errors
make[2]: *** [pfmlib_perf_event_pmu.o] Error 1

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