Unroll loop, atmost two iterations required.

1 files changed, 2 insertions, 3 deletions

diff --git a/src/vrrpv2.rs b/src/vrrpv2.rs
index c9d5031..643d6c3 100644
--- a/src/vrrpv2.rs
+++ b/src/vrrpv2.rs
@@ -200,9 +200,8 @@ fn checksum(bytes: &[u8]) -> u16 {
     if !remainder.is_empty() {
         sum += u32::from(remainder[0]);
     }
-    while (sum >> 16) > 0 {
-        sum = (sum & 0xffff) + (sum >> 16);
-    }
+    sum = (sum >> 16) + (sum & 0xffff);
+    sum += sum >> 16;
     !(sum as u16)
 }