vim-patch:8.1.0262: not enough testing for getftype()

Problem:    Not enough testing for getftype().
Solution:   Add a test. (Dominique Pelle, closes vim/vim#3300)
1598f9937a

src/nvim/eval.c

@@ -9874,7 +9874,7 @@ static void f_getftype(typval_T *argvars, typval_T *rettv, FunPtr fptr)
 # endif
 # ifdef S_ISSOCK
     else if (S_ISSOCK(mode))
-      t = "fifo";
+      t = "socket";
 # endif
     else
       t = "other";