linux: fix a mntent leak on failure to allocate a buffer

Signed-off-by: Brice Goglin <[email protected]>

Author: bgoglin

hwloc/topology-linux.c

@@ -2241,8 +2241,10 @@ hwloc_find_linux_cpuset_mntpnt(char **cgroup_mntpnt, char **cpuset_mntpnt, const
    */
   bufsize = hwloc_getpagesize()*4;
   buf = malloc(bufsize);
-  if (!buf)
+  if (!buf) {
+    endmntent(fd);
     return;
+  }
 
   while (getmntent_r(fd, &mntent, buf, bufsize)) {
     if (!strcmp(mntent.mnt_type, "cpuset")) {