io/romio341: Set default mca param value before registration

Setting the default right before registration is the well
known behavior and prevents issues as the pointer can be
set to NULL during param deregistration.

Signed-off-by: William Zhang <wilzhang.amazon.com>

Author: William Zhang

ompi/mca/io/romio341/src/io_romio341_component.c

@@ -113,9 +113,9 @@ mca_io_base_component_2_0_0_t mca_io_romio341_component = {
     .io_register_datarep = register_datarep,
 };
 
-static char *ompi_io_romio341_version = ROMIO_VERSION_STRING;
-static char *ompi_io_romio341_user_configure_params = MCA_io_romio341_USER_CONFIGURE_FLAGS;
-static char *ompi_io_romio341_complete_configure_params = MCA_io_romio341_COMPLETE_CONFIGURE_FLAGS;
+static char *ompi_io_romio341_version = NULL;
+static char *ompi_io_romio341_user_configure_params = NULL;
+static char *ompi_io_romio341_complete_configure_params = NULL;
 
 static int register_component(void)
 {
@@ -132,18 +132,21 @@ static int register_component(void)
                                            MCA_BASE_VAR_TYPE_INT, NULL, 0, 0,
                                            OPAL_INFO_LVL_9,
                                            MCA_BASE_VAR_SCOPE_READONLY, &delete_priority_param);
+    ompi_io_romio341_version = ROMIO_VERSION_STRING;
     (void) mca_base_component_var_register(&mca_io_romio341_component.io_version,
                                            "version", "Version of ROMIO", MCA_BASE_VAR_TYPE_STRING,
                                            NULL, 0, MCA_BASE_VAR_FLAG_DEFAULT_ONLY,
                                            OPAL_INFO_LVL_9,
                                            MCA_BASE_VAR_SCOPE_READONLY, &ompi_io_romio341_version);
+    ompi_io_romio341_user_configure_params = MCA_io_romio341_USER_CONFIGURE_FLAGS;
     (void) mca_base_component_var_register(&mca_io_romio341_component.io_version,
                                            "user_configure_params",
                                            "User-specified command line parameters passed to ROMIO's configure script",
                                            MCA_BASE_VAR_TYPE_STRING, NULL, 0,
                                            MCA_BASE_VAR_FLAG_DEFAULT_ONLY,
                                            OPAL_INFO_LVL_9,
                                            MCA_BASE_VAR_SCOPE_READONLY, &ompi_io_romio341_user_configure_params);
+    ompi_io_romio341_complete_configure_params = MCA_io_romio341_COMPLETE_CONFIGURE_FLAGS;
     (void) mca_base_component_var_register(&mca_io_romio341_component.io_version,
                                            "complete_configure_params",
                                            "Complete set of command line parameters passed to ROMIO's configure script",