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rgbasm: Fix a division by zero in section address specifiers.

--- a/src/asm/asmy.y

+++ b/src/asm/asmy.y

@@ -992,8 +992,16 @@

 				|	const T_OP_SHL const			{ $$ = $1 << $3; }

 				|	const T_OP_SHR const			{ $$ = $1 >> $3; }

 				|	const T_OP_MUL const			{ $$ = $1 * $3; }

-				|	const T_OP_DIV const			{ $$ = $1 / $3; }

-				|	const T_OP_MOD const			{ $$ = $1 % $3; }

+				|	const T_OP_DIV const			{

+	if ($3 == 0)

+		fatalerror("division by zero");

+	$$ = $1 / $3;

+	}

+				|	const T_OP_MOD const			{

+	if ($3 == 0)

+		fatalerror("division by zero");

+	$$ = $1 % 3;

+	}

 				|	T_OP_ADD const %prec NEG		{ $$ = +$2; }

 				|	T_OP_SUB const %prec NEG		{ $$ = -$2; }

 				|	T_OP_NOT const %prec NEG		{ $$ = 0xFFFFFFFF^$2; }