readahead: avoid activating the journal by accident, log directly to kmsg

src/readahead/readahead-collect.c

@@ -683,7 +683,7 @@ int main(int argc, char *argv[]) {
         int r;
         const char *root;
 
-        log_set_target(LOG_TARGET_AUTO);
+        log_set_target(LOG_TARGET_SAFE);
         log_parse_environment();
         log_open();
 

src/readahead/readahead-replay.c

@@ -360,7 +360,7 @@ int main(int argc, char*argv[]) {
         int r;
         const char *root;
 
-        log_set_target(LOG_TARGET_AUTO);
+        log_set_target(LOG_TARGET_SAFE);
         log_parse_environment();
         log_open();