zccord: Fix a panic in some iteration cases

Signed-off-by: Ian Jackson <ijackson@chiark.greenend.org.uk>

diff --git a/base/zcoord.rs b/base/zcoord.rs
index a7a5fb31704f5bf9b52f4b80d8ae383a29e660db..9ab0368303cd54e1ec477d32f338bf732c9c27b2 100644 (file)
--- a/base/zcoord.rs
+++ b/base/zcoord.rs
@@ -369,7 +369,7 @@ impl Mutable {
     *self.limbs.get(i).unwrap_or(&ZERO)
   }
   fn extend_to_limb(&mut self, i: usize) {
-    if self.limbs.len() < i {
+    if self.limbs.len() <= i {
       self.limbs.resize(i+1, ZERO);
     }
   }