assembler: small misc updates, I am tired

common/src/instructions/errors.rs

@@ -40,7 +40,7 @@ impl std::fmt::Display for InstructionDecodeError {
         match self {
             Self::InvalidOpcode(code) => write!(f, "invalid opcode, got {code:x}")?,
             Self::InvalidArgument(err) => {
-                write!(f, "invalid arguments, got an error {err}")?
+                write!(f, "invalid arguments, got an error {err}")?;
             }
         }