Fix: uptime_file variable was declared too late

When called with --help, the following error was shown:
Use of uninitialized value $uptime_file in concatenation (.) or string at

1 files changed, 3 insertions, 3 deletions

diff --git a/plugins-scripts/check_uptime.pl b/plugins-scripts/check_uptime.pl
index 8c1f3d20..27dc93ff 100755
--- a/plugins-scripts/check_uptime.pl
+++ b/plugins-scripts/check_uptime.pl
@@ -1,4 +1,4 @@
-#!@PERL@ -w
+#!/usr/bin/perl -w
 
 # check_uptime - check uptime to see how long the system is running.
 #
@@ -41,6 +41,8 @@ $ENV{'ENV'}='';
 $PROGNAME = "check_uptime";
 $state = $ERRORS{'UNKNOWN'};
 
+my $uptime_file = "/proc/uptime";
+
 
 # Process arguments
 
@@ -54,8 +56,6 @@ if ($status){
 
 # Get uptime info from file
 
-my $uptime_file = "/proc/uptime";
-
 if ( ! -r $uptime_file ) {
         print "ERROR: file '$uptime_file' is not readable\n";
         exit $ERRORS{"UNKNOWN"};