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Fix segfaults when using PC outside a section

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

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

@@ -106,7 +106,10 @@

 {

 	struct sSymbol *sym = sym_FindSymbol(tzSym);

-	if (!sym || !sym_IsConstant(sym)) {

+	if (sym == pPCSymbol && !pPCSymbol->pSection) {

+		yyerror("PC has no value outside a section");

+		rpn_Number(expr, 0);

+	} else if (!sym || !sym_IsConstant(sym)) {

 		rpn_Init(expr);

 		expr->isSymbol = true;

--- a/src/asm/symbol.c

+++ b/src/asm/symbol.c

@@ -230,7 +230,9 @@

 	struct sSymbol const *psym = sym_FindSymbol(s);

 	if (psym == pPCSymbol) {

-		if (pCurrentSection->nOrg == -1)

+		if (!pCurrentSection)

+			yyerror("PC has no value outside a section");

+		else if (pCurrentSection->nOrg == -1)

 			yyerror("Expected constant PC but section is not fixed");

 		else

 			return sym_GetValue(psym);

--- /dev/null

+++ b/test/asm/[email protected]

@@ -1,0 +1,1 @@

+assert @ || 1

--- /dev/null

+++ b/test/asm/[email protected]

@@ -1,0 +1,3 @@

+ERROR: [email protected](1):

+    PC has no value outside a section

+error: Assembly aborted (1 errors)!

--- /dev/null

+++ b/test/asm/[email protected]

@@ -1,0 +1,2 @@

+if {@}

+endc

--- /dev/null

+++ b/test/asm/[email protected]

@@ -1,0 +1,3 @@

+ERROR: [email protected](1):

+    PC has no value outside a section

+error: Assembly aborted (1 errors)!