Remove failure's use of GenericError (#8287)

automerge

programs/failure/src/lib.rs

@@ -13,5 +13,5 @@ fn process_instruction(
     _keyed_accounts: &[KeyedAccount],
     _data: &[u8],
 ) -> Result<(), InstructionError> {
-    Err(InstructionError::GenericError)
+    Err(InstructionError::CustomError(0))
 }

programs/failure/tests/failure.rs

@@ -23,6 +23,6 @@ fn test_program_native_failure() {
             .send_instruction(&alice_keypair, instruction)
             .unwrap_err()
             .unwrap(),
-        TransactionError::InstructionError(0, InstructionError::GenericError)
+        TransactionError::InstructionError(0, InstructionError::CustomError(0))
     );
 }