cmd/efidebug: missing initialization of load_options

Variable load_options must be initialized to NULL to avoid a segmentation
fault when freeing the memory this variable points to.

Signed-off-by: Heinrich Schuchardt <xypron.glpk@gmx.de>
diff --git a/cmd/efidebug.c b/cmd/efidebug.c
index d00d424..9874838 100644
--- a/cmd/efidebug.c
+++ b/cmd/efidebug.c
@@ -1126,7 +1126,7 @@
 	efi_uintn_t exit_data_size = 0;
 	u16 *exit_data = NULL;
 	efi_status_t ret;
-	void *load_options;
+	void *load_options = NULL;
 
 	ret = efi_bootmgr_load(&image, &load_options);
 	printf("efi_bootmgr_load() returned: %ld\n", ret & ~EFI_ERROR_MASK);