Compiler warning in userfunc.c

[Yegappan Lakshmanan]

Hi,

I am seeing the following compiler warning in userfunc.c:

userfunc.c: In function ‘ex_function’:
userfunc.c:2612:3: warning: ‘%s’ directive argument is null [-Wformat-overflow=]
 2612 |   semsg(_("E1056: expected a type: %s"), ret_type);
      |   ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The ret_type variable is set to NULL just before this line.

- Yegappan

[Bram Moolenaar]

I've been testing only with the error number, perhaps I should make it a
habit to test more of the message.

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