make busybox --install work even if /proc/self/exe doesn't exist

# size busybox_old busybox_unstripped
   text    data     bss     dec     hex filename
 680095    2704   15648  698447   aa84f busybox_old
 680099    2704   15648  698451   aa853 busybox_unstripped

1 files changed, 6 insertions, 14 deletions

diff --git a/applets/applets.c b/applets/applets.c
index bd3704394..f34124252 100644
--- a/applets/applets.c
+++ b/applets/applets.c
@@ -577,21 +577,13 @@ static int busybox_main(char **argv)
         }
 
         if (ENABLE_FEATURE_INSTALLER && strcmp(argv[1], "--install") == 0) {
-                int use_symbolic_links = 0;
-                char *busybox;
-
-                /* to use symlinks, or not to use symlinks... */
-                if (argv[2])
-                        if (strcmp(argv[2], "-s") == 0)
-                                use_symbolic_links = 1;
-
-                /* link */
-                busybox = xmalloc_readlink_or_warn("/proc/self/exe");
+                const char *busybox;
+                busybox = xmalloc_readlink_or_warn(bb_busybox_exec_path);
                 if (!busybox)
-                        return 1;
-                install_links(busybox, use_symbolic_links);
-                if (ENABLE_FEATURE_CLEAN_UP)
-                        free(busybox);
+                        busybox = bb_busybox_exec_path;
+                /* -s makes symlinks */
+                install_links(busybox,
+                                 argv[2] && strcmp(argv[2], "-s") == 0);
                 return 0;
         }