Fixed findings

List of Findings

Error: GCC_ANALYZER_WARNING (CWE-476): [#def1]
fwupd-2.0.16/plugins/dell-dock/fu-dell-dock-mst.c:276:17: warning[-Wanalyzer-null-dereference]: dereference of NULL ‘error_local’
fwupd-2.0.16/plugins/dell-dock/fu-dell-dock-mst.c:1029:1: enter_function: entry to ‘fu_dell_dock_mst_write_fw’
fwupd-2.0.16/plugins/dell-dock/fu-dell-dock-mst.c:1041:9: branch_true: following ‘true’ branch (when ‘device’ is non-NULL)...
fwupd-2.0.16/plugins/dell-dock/fu-dell-dock-mst.c:1042:9: branch_true: ...to here
fwupd-2.0.16/plugins/dell-dock/fu-dell-dock-mst.c:1042:9: branch_true: following ‘true’ branch...
fwupd-2.0.16/plugins/dell-dock/fu-dell-dock-mst.c:1043:9: branch_true: ...to here
fwupd-2.0.16/plugins/dell-dock/fu-dell-dock-mst.c:1043:9: branch_true: following ‘true’ branch...
fwupd-2.0.16/plugins/dell-dock/fu-dell-dock-mst.c:1046:14: branch_true: ...to here
fwupd-2.0.16/plugins/dell-dock/fu-dell-dock-mst.c:1046:12: branch_false: following ‘false’ branch...
fwupd-2.0.16/plugins/dell-dock/fu-dell-dock-mst.c:1050:14: branch_false: ...to here
fwupd-2.0.16/plugins/dell-dock/fu-dell-dock-mst.c:1050:12: branch_false: following ‘false’ branch...
fwupd-2.0.16/plugins/dell-dock/fu-dell-dock-mst.c:1054:14: branch_false: ...to here
fwupd-2.0.16/plugins/dell-dock/fu-dell-dock-mst.c:1055:12: branch_false: following ‘false’ branch...
fwupd-2.0.16/plugins/dell-dock/fu-dell-dock-mst.c:1057:16: branch_false: ...to here
fwupd-2.0.16/plugins/dell-dock/fu-dell-dock-mst.c:1066:14: call_function: calling ‘fu_dell_dock_mst_enable_remote_control’ from ‘fu_dell_dock_mst_write_fw’
#  274|   					 (guint8 *)data,
#  275|   					 &error_local)) {
#  276|-> 		g_debug("Failed to enable remote control: %s", error_local->message);
#  277|   		/* try to disable / re-enable */
#  278|   		if (!fu_dell_dock_mst_disable_remote_control(device, error))

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