qemu-io: Make alloc output useful when nb_sectors=1

There is no indication whether or not the sector is allocated when
nb_sectors=1:

  sector allocated at offset 64 KiB

This message is produced whether or not the sector is allocated.

Simply use the same message as the plural case, I don't think the
English is so broken that we need special case output here:

  0/1 sectors allocated at offset 64 KiB

This change does not affect qemu-iotests since nb_sectors=1 is not used
there.
Signed-off-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

qemu-io.c

@@ -1427,11 +1427,8 @@ alloc_f(int argc, char **argv)
 
 	cvtstr(offset, s1, sizeof(s1));
 
-	if (nb_sectors == 1)
-		printf("sector allocated at offset %s\n", s1);
-	else
-		printf("%d/%d sectors allocated at offset %s\n",
-			sum_alloc, nb_sectors, s1);
+	printf("%d/%d sectors allocated at offset %s\n",
+	       sum_alloc, nb_sectors, s1);
 	return 0;
 }