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bcm: invalidate cache on Fbinfo after firmware completion

--- a/sys/src/9/bcm/vcore.c

+++ b/sys/src/9/bcm/vcore.c

@@ -220,7 +220,8 @@

 	cachedwbinvse(fi, sizeof(*fi));

 	vcwrite(ChanFb, dmaaddr(fi));

 	if(vcread(ChanFb) != 0)

-		return 0;

+		return nil;

+	cachedinvse(fi, sizeof(*fi));

 	va = mmukmap(FRAMEBUFFER, (fi->base&~0xC0000000)|PHYSDRAM, fi->screensize);

 	if(va)

 		memset((char*)va, 0x7F, fi->screensize);