Fix #2276 - Replace a potentially infinite loop for hie

ale_linters/haskell/hie.vim

@@ -9,26 +9,20 @@ function! ale_linters#haskell#hie#GetProjectRoot(buffer) abort
 
     " If it's empty, search for the cabal file
     if empty(l:project_file)
-        let l:cabal_file = fnamemodify(bufname(a:buffer), ':p:h')
-        let l:paths = ''
-
-        while empty(matchstr(l:cabal_file, '^\(\/\|\(\w:\\\)\)$'))
-            let l:cabal_file = fnamemodify(l:cabal_file, ':h')
-            let l:paths = l:paths . l:cabal_file . ','
-        endwhile
-
+        " Search all of the paths except for the root filesystem path.
+        let l:paths = join(
+        \   ale#path#Upwards(expand('#' . a:buffer . ':p:h'))[:-2],
+        \   ','
+        \)
         let l:project_file = globpath(l:paths, '*.cabal')
     endif
 
-    " Either extract the project directory or take the current working
-    " directory
-    if !empty(l:project_file)
-        let l:project_file = fnamemodify(l:project_file, ':h')
-    else
-        let l:project_file = expand('#' . a:buffer . ':p:h')
+    " If we still can't find one, use the current file.
+    if empty(l:project_file)
+        let l:project_file = expand('#' . a:buffer . ':p')
     endif
 
-    return l:project_file
+    return fnamemodify(l:project_file, ':h')
 endfunction
 
 function! ale_linters#haskell#hie#GetCommand(buffer) abort