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[ld] Allow empty member name in newobj()

This field is going to be empty when we load an object file.

--- a/ld/obj.c

+++ b/ld/obj.c

@@ -23,18 +23,18 @@

 	len = strlen(fname);

 	obj = malloc(sizeof(*obj));

-	s = malloc(len+1);

+	s = malloc(len) + 1;

 	if (!obj || !s)

 		outmem();

-	obj->fname = memcpy(s, fname, len+1);

+	obj->fname = memcpy(s, fname, len);

 	if (!member) {

 		obj->member = NULL;

 	} else {

-		len = strlen(member);

-		if ((s = malloc(len+1)) == NULL)

+		len = strlen(member) + 1;

+		if ((s = malloc(len)) == NULL)

 			outmem();

-		obj->member = memcpy(s, member, len+1);

+		obj->member = memcpy(s, member, len);

 	}

 	obj->next = NULL;