minor formatting

modules/exploits/linux/local/bpf_sign_extension_priv_esc.rb

@@ -17,7 +17,7 @@ class MetasploitModule < Msf::Exploit::Local
         'Description'   => %q{
           Linux kernel prior to 4.13.0 utilizes the Berkeley Packet Filter
           which contains a vulnerability where it may improperly perform
-          sign extentension.  This can be utilized to priv escalate,
+          sign extension.  This can be utilized to priv escalate,
           this module has been tested on Ubuntu 16.04 with the 4.4.0-116
           kernel, and Linux Mint 18 with the 4.4.0-116-generic kernel.
         },
@@ -82,7 +82,7 @@ class MetasploitModule < Msf::Exploit::Local
         write_file("#{file_path}.c", file_content)
         register_file_for_cleanup("#{file_path}.c")
         output = cmd_exec(compile)
-        if output != ''
+        unless output.blank?
           print_error(output)
           fail_with(Failure::Unknown, "#{filename} at #{file_path}.c failed to compile")
         end
@@ -92,7 +92,7 @@ class MetasploitModule < Msf::Exploit::Local
     end
 
 
-    if check != CheckCode::Appears
+    unless check == CheckCode::Appears
       fail_with(Failure::NotVulnerable, 'Target not vulnerable! punt!')
     end