spice: Initialization stubs on qemu-spice.h

This reduces the number of CONFIG_SPICE #ifdefs in vl.c.

Cc: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: NGerd Hoffmann <kraxel@redhat.com>
Signed-off-by: NEduardo Habkost <ehabkost@redhat.com>

include/ui/qemu-spice.h

@@ -51,6 +51,8 @@ static inline CharDriverState *qemu_chr_open_spice_port(const char *name)
 
 #else  /* CONFIG_SPICE */
 
+#include "qemu/error-report.h"
+
 #define using_spice 0
 #define spice_displays 0
 static inline int qemu_spice_set_passwd(const char *passwd,
@@ -75,6 +77,17 @@ static inline int qemu_spice_display_add_client(int csock, int skipauth,
     return -1;
 }
 
+static inline void qemu_spice_display_init(void)
+{
+    /* This must never be called if CONFIG_SPICE is disabled */
+    error_report("spice support is disabled");
+    abort();
+}
+
+static inline void qemu_spice_init(void)
+{
+}
+
 #endif /* CONFIG_SPICE */
 
 static inline bool qemu_using_spice(Error **errp)

vl.c

@@ -4360,10 +4360,8 @@ int main(int argc, char **argv, char **envp)
 
     os_set_line_buffering();
 
-#ifdef CONFIG_SPICE
     /* spice needs the timers to be initialized by this point */
     qemu_spice_init();
-#endif
 
     cpu_ticks_init();
     if (icount_opts) {
@@ -4564,11 +4562,9 @@ int main(int argc, char **argv, char **envp)
         g_free(ret);
     }
 
-#ifdef CONFIG_SPICE
     if (using_spice) {
         qemu_spice_display_init();
     }
-#endif
 
     if (foreach_device_config(DEV_GDB, gdbserver_start) < 0) {
         exit(1);