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Simplify bit logical functions

All these functions were using a comparasion and letter a
call to next, and basically this is the same than accept, so
it is changed.

--- a/expr.c

+++ b/expr.c

@@ -417,10 +417,8 @@

 	register Node *np;

 	np = eq();

-	while (yytoken == '&') {

-		next();

+	while (accept('&'))

 		np = bitlogic(OBAND, np, eq());

-	}

 	return np;

 }

@@ -430,10 +428,8 @@

 	register Node *np;

 	np = bit_and();

-	while (yytoken == '^') {

-		next();

+	while (accept('^'))

 		np = bitlogic(OBXOR,  np, bit_and());

-	}

 	return np;

 }

@@ -443,10 +439,8 @@

 	register Node *np;

 	np = bit_xor();

-	while (yytoken == '|') {

-		next();

+	while (accept('|'))

 		np = bitlogic(OBOR, np, bit_xor());

-	}

 	return np;

 }