mips: revert commit b332d24a8e

Now that this code path is not triggered anymore during the tests,
revert commit b332d24a8e. Booting a MIPS
target without kernel nor bios doesn't really make sense. At the same
time replace fprintf(stderr, ...) by error_report().

Reviewed-by: Andreas Färber <afaerber@suse.de>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

hw/mips/mips_jazz.c

@@ -43,6 +43,7 @@
 #include "hw/sysbus.h"
 #include "exec/address-spaces.h"
 #include "sysemu/qtest.h"
+#include "qemu/error-report.h"
 
 enum jazz_model_e
 {
@@ -178,8 +179,8 @@ static void mips_jazz_init(MemoryRegion *address_space,
         bios_size = -1;
     }
     if ((bios_size < 0 || bios_size > MAGNUM_BIOS_SIZE) && !qtest_enabled()) {
-        fprintf(stderr, "qemu: Warning, could not load MIPS bios '%s'\n",
-                bios_name);
+        error_report("Could not load MIPS bios '%s'", bios_name);
+        exit(1);
     }
 
     /* Init CPU internal devices */