shared/logs-show: introduce journal_browse_prepare()

which combines sigbus_install() and bumping fd limit.

src/machine/machinectl.c

@@ -53,7 +53,6 @@
 #include "process-util.h"
 #include "ptyfwd.h"
 #include "rlimit-util.h"
-#include "sigbus.h"
 #include "signal-util.h"
 #include "sort-util.h"
 #include "stdio-util.h"
@@ -2430,14 +2429,12 @@ static int run(int argc, char *argv[]) {
         setlocale(LC_ALL, "");
         log_setup();
 
-        /* The journal merging logic potentially needs a lot of fds. */
-        (void) rlimit_nofile_bump(HIGH_RLIMIT_NOFILE);
-        sigbus_install();
-
         r = parse_argv(argc, argv);
         if (r <= 0)
                 return r;
 
+        journal_browse_prepare();
+
         if (STRPTR_IN_SET(argv[optind],
                           "import-tar", "import-raw", "import-fs",
                           "export-tar", "export-raw",