[ostree] ostree-prepare-root: Don't require an extraneous argument

[Colin Walters <walters src gnome org>]

commit 35df7a7eb4adbf262444ffc36a8f6253dddd7b2c
Author: Colin Walters <walters verbum org>
Date:   Sun Jun 2 22:18:19 2013 -0400

    ostree-prepare-root: Don't require an extraneous argument

 src/switchroot/ostree-prepare-root.c |    6 +++---
 1 files changed, 3 insertions(+), 3 deletions(-)
---
diff --git a/src/switchroot/ostree-prepare-root.c b/src/switchroot/ostree-prepare-root.c
index 65bb730..470ed3c 100644
--- a/src/switchroot/ostree-prepare-root.c
+++ b/src/switchroot/ostree-prepare-root.c
@@ -82,7 +82,7 @@ parse_ostree_cmdline (char **out_osname,
     {
       const char *next = strchr (iter, ' ');
       const char *next_nonspc = next;
-      while (*next_nonspc == ' ')
+      while (next_nonspc && *next_nonspc == ' ')
        next_nonspc += 1;
       if (strncmp (iter, "ostree=", strlen ("ostree=")) == 0)
         {
@@ -121,9 +121,9 @@ main(int argc, char *argv[])
   size_t len;
   int i;
 
-  if (argc < 3)
+  if (argc < 2)
     {
-      fprintf (stderr, "usage: ostree-prepare-root SYSROOT OSTREE\n");
+      fprintf (stderr, "usage: ostree-prepare-root SYSROOT\n");
       exit (1);
     }