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git/pack: remove stray '|='

We want to set the value, not or it. This is
probably the cause of some deltas gone wild.

--- a/pack.c

+++ b/pack.c

@@ -134,14 +134,14 @@

 		o->id = objcache.nobj;

 		o->flag |= Cexist;

 	}

-	if(o->prev)

+	if(o->prev != nil)

 		o->prev->next = o->next;

-	if(o->next)

+	if(o->next != nil)

 		o->next->prev = o->prev;

 	if(lrutail == o){

 		lrutail = o->prev;

 		lrutail->next = nil;

-	}else if(!lrutail)

+	}else if(lrutail != nil)

 		lrutail = o;

 	if(lruhead)

 		lruhead->prev = o;

@@ -154,7 +154,7 @@

 		ref(o);

 		ncache++;

 	}

-	while(ncache > cachemax){

+	while(ncache > cachemax && lrutail->prev != nil){

 		p = lrutail;

 		lrutail = p->prev;

 		lrutail->next = nil;

@@ -1543,7 +1543,7 @@

 	rbuf[0] = off & 0x7f;

 	for(i = 1; (off >>= 7) != 0; i++)

-		rbuf[i] |= (--off & 0x7f)|0x80;

+		rbuf[i] = (--off & 0x7f)|0x80;

 	j = 0;

 	while(i > 0)