mount.nfs: Fix auto protocol negotiation

Commit 71b807e1 introduce a regression that caused v3 not to be tried when v4 was not supported by the server during auto negation.

A check of the type in nfs_nfs_version() was reverted back to only check for the "nfs4" string not the "nfs" string which fixed the problem.

Signed-off-by Steve Dickson <[email protected]>

---
 utils/mount/network.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

utils/mount/network.c +2 -2

index 9a2c878..e490399 100644
@@ -1279,8 +1279,8 @@ nfs_nfs_version(char *type, struct mount_options *options, struct nfs_version *v
 		}
 	}
 
-	if (!found && strncmp(type, "nfs", 3) == 0)
-		version_val = "4";
+	if (!found && strcmp(type, "nfs4") == 0)
+		version_val = type + 3;
 	else if (!found)
 		return 1;
 	else if (i <= 2 ) {