Fix include guard (#356)

Co-authored-by: Marius Brehler <marius.brehler@iml.fraunhofer.de>
diff --git a/lib/Conversion/PassDetail.h b/lib/Conversion/PassDetail.h
index ee4e806..081339a 100644
--- a/lib/Conversion/PassDetail.h
+++ b/lib/Conversion/PassDetail.h
@@ -6,8 +6,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef DIALECT_EMITC_CONVERSION_PASSDETAIL_H
-#define DIALECT_EMITC_CONVERSION_PASSDETAIL_H
+#ifndef EMITC_CONVERSION_PASSDETAIL_H
+#define EMITC_CONVERSION_PASSDETAIL_H
 
 #include "mlir/Dialect/Func/IR/FuncOps.h"
 #include "mlir/Pass/Pass.h"
@@ -23,4 +23,4 @@
 } // namespace emitc
 } // namespace mlir
 
-#endif // DIALECT_EMITC_CONVERSION_PASSDETAIL_H
+#endif // EMITC_CONVERSION_PASSDETAIL_H