radv: fix rendering to b10g11r11_ufloat_pack32

doom was causing a printf about an illegal color, it was due the
non-void returning -1, and the other function checking for 4,
align these.

Reviewed-by: Edward O'Callaghan <funfunctor@folklore1984.net>
Reviewed-by: Bas Nieuwenhuizen <bas@basnieuwenhuizen.nl>
Signed-off-by: Dave Airlie <airlied@redhat.com>
diff --git a/src/amd/vulkan/radv_formats.c b/src/amd/vulkan/radv_formats.c
index fe786b3..e276432 100644
--- a/src/amd/vulkan/radv_formats.c
+++ b/src/amd/vulkan/radv_formats.c
@@ -394,7 +394,7 @@
 					int first_non_void)
 {
 	unsigned ntype;
-	if (first_non_void == 4 || desc->channel[first_non_void].type == VK_FORMAT_TYPE_FLOAT)
+	if (first_non_void == -1 || desc->channel[first_non_void].type == VK_FORMAT_TYPE_FLOAT)
 		ntype = V_028C70_NUMBER_FLOAT;
 	else {
 		ntype = V_028C70_NUMBER_UNORM;