Merge #325

325: fix cluster size r=therealprof a=burrbull

Fix misusing cluster size tag.

Close #299 .

r? @therealprof 

Co-authored-by: Andrey Zgarbul <zgarbul.andrey@gmail.com>

Author: bors[bot]

src/generate/peripheral.rs

@@ -599,10 +599,7 @@ fn cluster_size_in_bits(info: &ClusterInfo, defs: &Defaults) -> Result<u32> {
 fn expand_cluster(cluster: &Cluster, defs: &Defaults) -> Result<Vec<RegisterBlockField>> {
     let mut cluster_expanded = vec![];
 
-    let cluster_size = cluster
-        .size
-        .ok_or_else(|| format!("Cluster {} has no explictly defined size", cluster.name))
-        .or_else(|_e| cluster_size_in_bits(cluster, defs))
+    let cluster_size = cluster_size_in_bits(cluster, defs)
         .chain_err(|| format!("Cluster {} has no determinable `size` field", cluster.name))?;
 
     match cluster {