fellow_cache: _obj_get to return latched error

src/fellow_cache.c

@@ -5744,7 +5744,8 @@ struct objcore **ocp, uintptr_t priv2, unsigned crit)
 			break;
 		case FCO_READFAIL:
 			fellow_cache_obj_deref(fc, fco);
-			return (FCR_IOFAIL("hit READFAIL object"));
+			fco_latch_err(fco, FCR_IOFAIL("hit READFAIL object"));
+			break;
 		case FCO_EVICT:
 			// race, retry
 			fellow_cache_obj_deref(fc, fco);
@@ -5753,7 +5754,7 @@ struct objcore **ocp, uintptr_t priv2, unsigned crit)
 			WRONG("fco state");
 		}
 
-		return (FCR_OK(fco));
+		return (fco->fcr);
 	}
 
 	TAKEZN(fco, nfco);
@@ -5879,7 +5880,8 @@ struct objcore **ocp, uintptr_t priv2, unsigned crit)
 	if (dowry.bits)
 		AN(buddy_return_ptr_page(rets, &dowry));
 	buddy_return(rets);
-	return (FCR_OK(fco));
+	fco->fcr = FCR_OK(fco);
+	return (fco->fcr);
   err:
 	if (ocp) {
 		AZ(*ocp);