MFC r271534: MFV r271517:

In zil_claim, don't issue warning if we get EBUSY (inconsistent) when
opening an objset, instead, ignore it silently.

Illumos issue:

    5140 message about "%recv could not be opened" is printed when
         booting after crash

Approved by:	re (gjb)

sys/cddl/contrib/opensolaris/uts/common/fs/zfs/zil.c

@@ -647,7 +647,14 @@ zil_claim(const char *osname, void *txarg)
 
 	error = dmu_objset_own(osname, DMU_OST_ANY, B_FALSE, FTAG, &os);
 	if (error != 0) {
-		cmn_err(CE_WARN, "can't open objset for %s", osname);
+		/*
+		 * EBUSY indicates that the objset is inconsistent, in which
+		 * case it can not have a ZIL.
+		 */
+		if (error != EBUSY) {
+			cmn_err(CE_WARN, "can't open objset for %s, error %u",
+			    osname, error);
+		}
 		return (0);
 	}