localmodconfig: Set default value for ksource in streamline_config.pl

Running streamline_config.pl as it's shown it in the comment header,
you will get a warning about $ksource being uninitialized.  This is
because $ksource is set to ARGV[0], but the examples don't require any
arguments.  Fix by setting ksource to . if no ARGV[0] is given.

Signed-off-by: Bill Pemberton <wfp5p@virginia.edu>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

scripts/kconfig/streamline_config.pl

@@ -135,7 +135,7 @@ sub find_config {
 	   "localyesconfig" => \$localyesconfig);
 
 # Get the build source and top level Kconfig file (passed in)
-my $ksource = $ARGV[0];
+my $ksource = ($ARGV[0] ? $ARGV[0] : '.');
 my $kconfig = $ARGV[1];
 my $lsmod_file = $ENV{'LSMOD'};