Better check if argc is 0 because argv[0] is later used.

Review URL: http://codereview.chromium.org/10093005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@132580 0039d316-1c4b-4281-b951-d872f2087c98

AUTHORS

@@ -174,3 +174,4 @@ Arun Mankuzhi <arun.m@samsung.com>
 Taylor Price <trprice@gmail.com>
 Alexandru Chiculita <achicu@adobe.com>
 Eric Rescorla <ekr@rtfm.com>
+Erik Sjölund <erik.sjolund@gmail.com>

sandbox/linux/suid/sandbox.c

@@ -381,6 +381,10 @@ static bool SetupChildEnvironment() {
 
 int main(int argc, char **argv) {
   if (argc <= 1) {
+    if (argc == 0) {
+      return 1;
+    }
+
     fprintf(stderr, "Usage: %s <renderer process> <args...>\n", argv[0]);
     return 1;
   }