xkbscan: resolve build warning/rpmlint error

xkbscan.l: In function 'setScanState':
xkbscan.l:201:1: warning: control reaches end of non-void function
I: Program returns random data in a function
E: libxkbcommon no-return-in-nonvoid-function xkbscan.l:201

Change return type of setScanState to void, since a return value is
never used by its callers.

Signed-off-by: Jan Engelhardt <jengelh@medozas.de>

src/xkbcomp/parseutils.h

@@ -191,8 +191,8 @@ extern void yyerror(const char *        /* s */
 extern int yylex(void);
 extern int yyparse(void);
 
-extern int setScanState(char * /* file */ ,
-                        int     /* line */
+extern void setScanState(char * /* file */ ,
+                         int     /* line */
     );
 
 extern FILE *yyin;

src/xkbcomp/xkbscan.l

@@ -193,7 +193,7 @@ yyerror(const char *s)
     return;
 }
 
-int setScanState(char *file, int lineno)
+void setScanState(char *file, int lineno)
 {
   yylineno = 1;
   scanFile = file;