fix a strange bug when echoing error messages

In the javascript:jshint checker the error messages are being returned
with a newline prefixed to the front. I have tried to fix this in the
errorformat - but I cant see anything that would cause it.

Im not sure if this is a one-off thing, but strip out all new lines here
just in case.

plugin/syntastic.vim

@@ -313,9 +313,18 @@ function! s:WideMsg(msg)
     let old_ruler = &ruler
     let old_showcmd = &showcmd
 
+    let msg = strpart(a:msg, 0, winwidth(0)-1)
+
+    "This is here because it is possible for some error messages to begin with
+    "\n which will cause a "press enter" prompt. I have noticed this in the
+    "javascript:jshint checker and have been unable to figure out why it
+    "happens
+    let msg = substitute(msg, "\n", "", "g")
+
     set noruler noshowcmd
     redraw
-    echo strpart(a:msg, 0, winwidth(0)-1)
+
+    echo msg
 
     let &ruler=old_ruler
     let &showcmd=old_showcmd