[mlir][Python] Fix cmake typo keeping the extension from installing.

diff --git a/mlir/cmake/modules/AddMLIRPythonExtension.cmake b/mlir/cmake/modules/AddMLIRPythonExtension.cmake
index e5e81d6..5d9bb97 100644 (file)
--- a/mlir/cmake/modules/AddMLIRPythonExtension.cmake
+++ b/mlir/cmake/modules/AddMLIRPythonExtension.cmake
@@ -97,7 +97,7 @@ function(add_mlir_python_extension libname extname)
   ################################################################################
   # Install
   ################################################################################
-  if (INSTALL_DIR)
+  if (ARG_INSTALL_DIR)
     install(TARGETS ${libname}
       COMPONENT ${libname}
       LIBRARY DESTINATION ${ARG_INSTALL_DIR}