fix 'Can't redeclare "my" in "my" ...' error in 5.24

Using a my within a my on in 5.24 is now an error so don't do that any
more.

Thanks to gregor hermann for submitting the patch!

Author: gregoa

lib/Git/PurePerl.pm

@@ -156,7 +156,7 @@ sub ref_names {
         foreach my $line ( $packed_refs->slurp( chomp => 1 ) ) {
             next if $line =~ /^#/;
             next if $line =~ /^\^/;
-            my ( $sha1, my $name ) = split ' ', $line;
+            my ( $sha1, $name ) = split ' ', $line;
             push @names, $name;
         }
     }
@@ -202,7 +202,7 @@ sub ref_sha1 {
         my $last_sha1;
         foreach my $line ( $packed_refs->slurp( chomp => 1 ) ) {
             next if $line =~ /^#/;
-            my ( $sha1, my $name ) = split ' ', $line;
+            my ( $sha1, $name ) = split ' ', $line;
             $sha1 =~ s/^\^//;
             $name ||= $last_name;