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[as] Fix error() in nextline()

Nextline() was calling error() but the reovery point was set after
the call to nextline().

--- a/as/main.c

+++ b/as/main.c

@@ -63,12 +63,10 @@

 	if ((fp = fopen(fname, "r")) == NULL)

 		die("as: error opening '%s'", fname);

-

 	isections();

-	while (nextline(fp, &line)) {

-		if (setjmp(recover))

-			continue;

+	setjmp(recover);

+	while (nextline(fp, &line)) {

 		linesym = NULL;

 		if (line.label)