[monitoring-plugin-perl] Pass params validation by ref not copy

[Tom Ryder]

 Module: monitoring-plugin-perl
 Branch: master
 Commit: 6518f384cc20561ddc0df32414a714164dd2eb95
 Author: Tom Ryder <tom at sanctum.geek.nz>
   Date: Sat Dec 16 13:34:38 2017 +1300
    URL: https://www.monitoring-plugins.org/repositories/monitoring-plugin-perl/commit/?id=6518f38

Pass params validation by ref not copy

Since Params::Validate::validate() doesn't seem to actually mess with
this specification, may as well pass a reference rather than bother
copying the whole thing.

---

 lib/Monitoring/Plugin/Getopt.pm | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/Monitoring/Plugin/Getopt.pm b/lib/Monitoring/Plugin/Getopt.pm
index b5a9ab4..65c872f 100644
--- a/lib/Monitoring/Plugin/Getopt.pm
+++ b/lib/Monitoring/Plugin/Getopt.pm
@@ -393,7 +393,7 @@ sub arg
 
   # Named args
   if (exists $params{$_[0]} && scalar @_ % 2 == 0) {
-    %args = validate( @_, { %params });
+    %args = validate( @_, \%params );
   }
 
   # Positional args