yacc.c: fixes

[Akim Demaille]

commit 16c77b4ba2ece1b52bfd9c381ee8b6226b3e3db5
Author: Akim Demaille <address@hidden>
Date:   Wed Jan 22 18:19:20 2020 +0100

    yacc.c: fixes
    
    * data/skeletons/yacc.c: Avoid warnings about unused functions.
    Fix typo.

diff --git a/data/skeletons/yacc.c b/data/skeletons/yacc.c
index 44904d6c..91173caa 100644
--- a/data/skeletons/yacc.c
+++ b/data/skeletons/yacc.c
@@ -1192,13 +1192,16 @@ yysyntax_error_arguments (const yyparse_context_t 
*yyctx,
 ]m4_case(b4_percent_define_get([[parse.error]]),
          [custom],
 [b4_locations_if([[/*  The location of this context.  */
+static YYLTYPE *
+yyparse_context_location (const yyparse_context_t *yyctx) YY_ATTRIBUTE_UNUSED;
+
 static YYLTYPE *
 yyparse_context_location (const yyparse_context_t *yyctx)
 {
   return yyctx->yylloc;
 }]])[
 
-/* User defined funtion to report a syntax error.  */
+/* User defined function to report a syntax error.  */
 ]b4_function_declare([yyreport_syntax_error], [static int],
                      [[[const yyparse_context_t *yyctx]], [[yyctx]]],
                      b4_parse_param)],