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Merge pull request #16 from yenatch/eval-rpn-bank

rgbasm: Evaluate BANK() arguments to verify they exist.

--- a/src/asm/rpn.c

+++ b/src/asm/rpn.c

@@ -114,14 +114,11 @@

 rpn_Bank(struct Expression * expr, char *tzSym)

 {

 	if (!sym_isConstant(tzSym)) {

-		struct sSymbol *psym;

-

 		rpn_Reset(expr);

-		psym = sym_FindSymbol(tzSym);

-		if (nPass == 2 && psym == NULL) {

-			yyerror("'%s' not defined", tzSym);

-		}

+		/* Check that the symbol exists by evaluating and discarding the value. */

+		sym_GetValue(tzSym);

+

 		expr->isReloc = 1;

 		pushbyte(expr, RPN_BANK);

 		while (*tzSym)