Fixes r12634, should be a regex not a not-equal. Using unless instead of if to avoid negative matching.

git-svn-id: file:///home/svn/framework3/trunk@12648 4d416f70-5f16-0410-b530-b9f4589650da

lib/rex/parser/nmap_xml.rb

@@ -117,7 +117,7 @@ class NmapXMLStreamParser
 				end
 			end
 		rescue NoMethodError => err
-			raise err if err.message != /NilClass/
+			raise err unless err.message =~ /NilClass/
 		end
 	end