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[as] Get rid of : in labels definition

--- a/as/parser.c

+++ b/as/parser.c

@@ -88,9 +88,14 @@

 extract(char *s, struct line *lp)

 {

 	int r = 0;

+	size_t len;

-	if (lp->label = field(&s))

+	if (lp->label = field(&s)) {

+		len = strlen(lp->label);

+		if (lp->label[len-1] == ':')

+			lp->label[len-1] = '\0';

 		r++;

+	}

 	if (lp->op = field(&s))

 		r++;

 	if (lp->args = field(&s))