core: fix memory leak on reload

core: fix memory leak on reload

==1== HEAP SUMMARY:
==1==     in use at exit: 61,728 bytes in 22 blocks
==1==   total heap usage: 258,122 allocs, 258,100 frees, 78,219,628
bytes allocated
==1==
==1== 16 bytes in 1 blocks are definitely lost in loss record 1 of 6
==1==    at 0x4C2BBCF: malloc (vg_replace_malloc.c:299)
==1==    by 0x1E350E: memdup (alloc-util.c:34)
==1==    by 0x135AFB: memdup_multiply (alloc-util.h:74)
==1==    by 0x140F97: manager_set_default_rlimits (manager.c:2929)
==1==    by 0x1303DA: manager_set_defaults (main.c:737)
==1==    by 0x133A02: main (main.c:1718)
==1==
==1== 272 bytes in 17 blocks are definitely lost in loss record 2 of 6
==1==    at 0x4C2BBCF: malloc (vg_replace_malloc.c:299)
==1==    by 0x1E350E: memdup (alloc-util.c:34)
==1==    by 0x135AFB: memdup_multiply (alloc-util.h:74)
==1==    by 0x140F97: manager_set_default_rlimits (manager.c:2929)
==1==    by 0x1303DA: manager_set_defaults (main.c:737)
==1==    by 0x13480D: main (main.c:1828)
==1==
==1== LEAK SUMMARY:
==1==    definitely lost: 288 bytes in 18 blocks
==1==    indirectly lost: 0 bytes in 0 blocks
==1==      possibly lost: 0 bytes in 0 blocks
==1==    still reachable: 61,440 bytes in 4 blocks
==1==         suppressed: 0 bytes in 0 blocks
==1== Reachable blocks (those to which a pointer was found) are not
shown.
==1== To see them, rerun with: --leak-check=full --show-leak-kinds=all