Memory leak in libpfm4 using PAPI

#include <papi.h>
int main(int argv, char **argc) {
    PAPI_library_init(PAPI_VER_CURRENT);
    PAPI_shutdown();
}

=================================================================
==8743==ERROR: LeakSanitizer: detected memory leaks

Direct leak of 4443 byte(s) in 47 object(s) allocated from:
    #0 0x5596b4e37c91 in malloc (papi_memory+0xe0c91)
    #1 0x7f80d3321f36 in pfmlib_build_fstr ./papi/src/libpfm4/lib/pfmlib_common.c:867:10
    #2 0x7f80d33283d8 in pfmlib_perf_event_encode ./papi/src/libpfm4/lib/pfmlib_perf_event.c:333:8
    #3 0x7f80d33238cc in pfm_get_os_event_encoding ./papi/src/libpfm4/lib/pfmlib_common.c:1614:9
    #4 0x7f80d46ad121 in allocate_native_event ./papi/src/components/perf_event/pe_libpfm4_events.c:193:8

SUMMARY: AddressSanitizer: 4443 byte(s) leaked in 47 allocation(s).

@@ -337,8 +337,10 @@ pfmlib_perf_event_encode(void *this, const char *str, int dfl_plm, void *data)
    }
    ret = pfmlib_build_fstr(&e, arg.fstr);

    - if (ret == PFM_SUCCESS)
    + if (ret == PFM_SUCCESS) {
        memcpy(uarg, &arg, sz);
    +   free(*arg.fstr);
    + }

error_fstr:
    if (ret != PFM_SUCCESS)
        free(arg.fstr);