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Convert next in void function

The value returned by next is used only in a place, so it is better convert
it into  void value and modify the place where return value is used.

--- a/decl.c

+++ b/decl.c

@@ -205,7 +205,8 @@

 	for (bp = qlf; yytoken == '*' && bp != lim; ++bp) {

 		*bp = 0;

 	repeat_qlf:

-		switch (next()) {

+		next();

+		switch (yytoken) {

 		case CONST:

 			if (!(*bp ^= T_CONST))

 				goto duplicated;

--- a/lex.c

+++ b/lex.c

@@ -128,7 +128,7 @@

 	}

 }

-unsigned char next(void)

+void next(void)

 {

 	register unsigned char c;

--- a/tokens.h

+++ b/tokens.h

@@ -48,7 +48,7 @@

 extern void init_lex(void);

-extern unsigned char next(void);

+extern void next(void);

 extern char accept(unsigned char tok);

 extern void expect(unsigned char tok);

 extern void init_keywords(void);