journalctl: actually run the static destructors

In journalctl we don't run the static destructors defined via
the STATIC_DESTRUCTOR_REGISTER() macro, since it requires a corresponding
static_destruct() call. In most cases this is handled by
the DEFINE_(TEST_)?MAIN*() macros, but journalctl defines its own main
function, so let's handle that as well.

$ valgrind --suppressions=valgrind.supp --show-leak-kinds=all --leak-check=full build/journalctl --no-pager -u system.slice -n 10 >/dev/null
==2778093== Memcheck, a memory error detector
==2778093== Copyright (C) 2002-2022, and GNU GPL'd, by Julian Seward et al.
==2778093== Using Valgrind-3.19.0 and LibVEX; rerun with -h for copyright info
==2778093== Command: build/journalctl --no-pager -u system.slice -n 10
==2778093==
==2778093==
==2778093== HEAP SUMMARY:
==2778093==     in use at exit: 8,221 bytes in 4 blocks
==2778093==   total heap usage: 458 allocs, 454 frees, 255,182 bytes allocated
==2778093==
==2778093== 13 bytes in 1 blocks are still reachable in loss record 1 of 4
==2778093==    at 0x484586F: malloc (vg_replace_malloc.c:381)
==2778093==    by 0x4DA256D: strdup (strdup.c:42)
==2778093==    by 0x4ADB747: strv_extend_with_size (strv.c:544)
==2778093==    by 0x405386: strv_extend (strv.h:45)
==2778093==    by 0x40816F: parse_argv (journalctl.c:933)
==2778093==    by 0x40EAB5: main (journalctl.c:2111)
==2778093==
==2778093== 16 bytes in 1 blocks are still reachable in loss record 2 of 4
==2778093==    at 0x484578A: malloc (vg_replace_malloc.c:380)
==2778093==    by 0x484A70B: realloc (vg_replace_malloc.c:1437)
==2778093==    by 0x4ADB2A3: strv_push_with_size (strv.c:423)
==2778093==    by 0x4ADB620: strv_consume_with_size (strv.c:496)
==2778093==    by 0x4ADB770: strv_extend_with_size (strv.c:548)
==2778093==    by 0x405386: strv_extend (strv.h:45)
==2778093==    by 0x40816F: parse_argv (journalctl.c:933)
==2778093==    by 0x40EAB5: main (journalctl.c:2111)
==2778093==
==2778093== LEAK SUMMARY:
==2778093==    definitely lost: 0 bytes in 0 blocks
==2778093==    indirectly lost: 0 bytes in 0 blocks
==2778093==      possibly lost: 0 bytes in 0 blocks
==2778093==    still reachable: 29 bytes in 2 blocks
==2778093==         suppressed: 8,192 bytes in 2 blocks
==2778093==
==2778093== For lists of detected and suppressed errors, rerun with: -s
==2778093== ERROR SUMMARY: 0 errors from 0 contexts (suppressed: 0 from 0)

1 files changed, 1 insertions, 0 deletions

diff --git a/src/journal/journalctl.c b/src/journal/journalctl.c
index b2883ff177..1df27d1cc5 100644
--- a/src/journal/journalctl.c
+++ b/src/journal/journalctl.c
@@ -2744,5 +2744,6 @@ finish:
                  * in scripts and such */
                 r = -ENOENT;
 
+        static_destruct();
         return r < 0 ? EXIT_FAILURE : EXIT_SUCCESS;
 }