Fixes #261. Default the exploit arch to x86 so we dont match on the wrong payloads

git-svn-id: file:///home/svn/framework3/trunk@5959 4d416f70-5f16-0410-b530-b9f4589650da

lib/msf/core/exploit.rb

@@ -671,11 +671,12 @@ class Exploit < Msf::Module
 		
 		c_platform = (target and target.platform) ? target.platform : platform
 		c_arch     = (target and target.arch)     ? target.arch     : (arch == []) ? nil : arch
-
+		c_arch   ||= [ ARCH_X86 ]
+		
 		framework.payloads.each_module(
 			'Platform' => c_platform,
 			'Arch'     => c_arch ) { |name, mod|
-
+		
 			# Skip over payloads that are too big
 			if ((payload_space) and 
 			    (framework.payloads.sizes[name]) and