[hackers] [sbase] sbase-box: Fix segmentation fault when exe without args

[Jules Maselbas]

when sbase-box is executed without argument, the check sbase-box
options doesn't verify the argument count leading to a segfault.

Add a check on the argc before parsing sbase-box options (currently
only `-i`)

---
 scripts/mkbox | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/scripts/mkbox b/scripts/mkbox
index b9e9bb0..db2bdb9 100755
--- a/scripts/mkbox
+++ b/scripts/mkbox
@@ -76,7 +76,7 @@ main(int argc, char *argv[])
        char *s = basename(argv[0]);
        struct cmd *bp;
 
-       if(!strcmp(s,"sbase-box")) {
+       if (!strcmp(s, "sbase-box") && argc > 1) {
                argc--; argv++;
                if (strcmp(argv[0], "-i") == 0) {
                        install(argv[1]);
-- 
2.42.1