vl: Make display_type a local variable

Now display_type is only used inside main(), and don't need to be a
global variable.

Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
diff --git a/include/sysemu/sysemu.h b/include/sysemu/sysemu.h
index 6076b80..7e9f93e 100644
--- a/include/sysemu/sysemu.h
+++ b/include/sysemu/sysemu.h
@@ -155,7 +155,6 @@
 extern int graphic_width;
 extern int graphic_height;
 extern int graphic_depth;
-extern DisplayType display_type;
 extern int display_opengl;
 extern const char *keyboard_layout;
 extern int win2k_install_hack;
diff --git a/vl.c b/vl.c
index 35ed954..0d10ceb 100644
--- a/vl.c
+++ b/vl.c
@@ -129,7 +129,6 @@
 static int data_dir_idx;
 const char *bios_name = NULL;
 enum vga_retrace_method vga_retrace_method = VGA_RETRACE_DUMB;
-DisplayType display_type = DT_DEFAULT;
 int request_opengl = -1;
 int display_opengl;
 static int display_remote;
@@ -2963,6 +2962,7 @@
     bool defconfig = true;
     bool userconfig = true;
     bool nographic = false;
+    DisplayType display_type = DT_DEFAULT;
     const char *log_mask = NULL;
     const char *log_file = NULL;
     char *trace_file = NULL;