Use get_target_arch

modules/exploits/windows/local/ms15_078_atmfd_bof.rb

@@ -92,7 +92,6 @@ class Metasploit3 < Msf::Exploit::Local
 
   def check
     # We have tested only windows 8.1
-    vprint_status("#{sysinfo['OS']}")
     if sysinfo['OS'] !~ /Windows 8/i
       return Exploit::CheckCode::Unknown
     end
@@ -143,7 +142,7 @@ class Metasploit3 < Msf::Exploit::Local
       fail_with(Failure::NotVulnerable, 'Exploit not available on this system.')
     end
 
-    if sysinfo['Architecture'] =~ /wow64/i
+    unless get_target_arch == ARCH_X86_64
       fail_with(Failure::NoTarget, 'Running against WOW64 is not supported')
     end