Remove Underrun error variant

Author: eldruin

src/errors.rs

@@ -28,8 +28,6 @@ pub mod i2c {
         NoAcknowledge,
         /// The peripheral receive buffer was overrun
         Overrun,
-        /// The peripheral send buffer ran out of data
-        Underrun,
         /// A different error occurred. The original error may contain more information.
         Other,
     }
@@ -50,7 +48,6 @@ pub mod i2c {
                 ),
                 Self::NoAcknowledge => write!(f, "A bus operation was not acknowledged"),
                 Self::Overrun => write!(f, "The peripheral receive buffer was overrun"),
-                Self::Underrun => write!(f, "The peripheral send buffer ran out of data"),
                 Self::Other => write!(
                     f,
                     "A different error occurred. The original error may contain more information"