Fix typo and debugging statement in :Gwrite

plugin/fugitive.vim

@@ -593,7 +593,6 @@ function! s:Write(force,...) abort
       endfor
     endfor
     if !exists('did')
-      echoerr 'fail'
       call writefile(readfile(temp,'b'),file,'b')
     endif
   else
@@ -629,7 +628,7 @@ function! s:Write(force,...) abort
         try
           let lnum = line('.')
           let last = line('$')
-          silent $read `=file'
+          silent $read `=file`
           silent execute '1,'.last.'delete_'
           silent execute lnum
           set nomodified