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ptp: fix fallback case

--- a/sys/src/cmd/nusb/ptp/ptp.c

+++ b/sys/src/cmd/nusb/ptp/ptp.c

@@ -826,7 +826,7 @@

 				respond(r, nil);

 				return;

 			}

-			while(nod->data == nil){

+			if(nod->data == nil){

 				int offset, count, pos;

 				offset = r->ifcall.offset;

@@ -857,8 +857,8 @@

 			/* no break */

 		case Qthumb:

 			if(nod->data == nil){

-				p = nil;

 				np = 0;

+				p = nil;

 				if(ptprpc(r, TYPE(path)==Qthumb ? GetThumb : GetObject,

 					1|DataRecv, nod->handle, &p, &np) < 0){

 					free(p);

-- 

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