patch 8.0.1492: memory leak in balloon_split()

Problem:    Memory leak in balloon_split().
Solution:   Free the balloon lines. Free the balloon when exiting.

src/evalfunc.c

@@ -1447,6 +1447,8 @@ f_balloon_split(typval_T *argvars, typval_T *rettv UNUSED)
 	    /* Skip the first and last item, they are always empty. */
 	    for (i = 1; i < size - 1; ++i)
 		list_append_string(rettv->vval.v_list, array[i].pum_text, -1);
+	    while (size > 0)
+		vim_free(array[--size].pum_text);
 	    vim_free(array);
 	}
     }

src/misc2.c

@@ -1116,6 +1116,10 @@ free_all_mem(void)
     spell_free_all();
 # endif
 
+#if defined(FEAT_INS_EXPAND) && defined(FEAT_BEVAL_TERM)
+    ui_remove_balloon();
+# endif
+
 # if defined(FEAT_USR_CMDS)
     /* Clear user commands (before deleting buffers). */
     ex_comclear(NULL);

src/version.c

@@ -771,6 +771,8 @@ static char *(features[]) =
 
 static int included_patches[] =
 {   /* Add new patch number below this line */
+/**/
+    1492,
 /**/
     1491,
 /**/