[gnumeric] GnmFunc: fix help argument name extraction.

[Morten Welinder <mortenw src gnome org>]

commit 0115f48a38ca2005fbad17316903f7eaaf887148
Author: Morten Welinder <terra gnome org>
Date:   Sat Jun 2 21:06:11 2018 -0400

    GnmFunc: fix help argument name extraction.

 src/func.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)
---
diff --git a/src/func.c b/src/func.c
index bcd3f31b6..f3e18baef 100644
--- a/src/func.c
+++ b/src/func.c
@@ -142,6 +142,7 @@ gnm_func_load_stub (GnmFunc *func)
        g_signal_emit (G_OBJECT (func), signals[SIG_LOAD_STUB], 0);
 
        if (func->fn_type == GNM_FUNC_TYPE_STUB) {
+               g_printerr ("Failed to load %s\n", func->name);
                gnm_func_set_varargs (func, error_function_no_full_info, NULL);
                gnm_func_set_help (func, NULL, 0);
        }
@@ -457,10 +458,11 @@ gnm_func_set_help (GnmFunc *func, GnmFuncHelp const *help, int n)
                func->help[n].type = GNM_FUNC_HELP_END;
                func->help[n].text = NULL;
 
+               func->help_count = n;
                gnm_func_create_arg_names (func);
+       } else {
+               func->help_count = 0;
        }
-
-       func->help_count = n;
 }