fbdev: nv: fix sparse noise

Mostly signedness fixes.  nv10_sim_state existence in both drivers suggests
that one of them should be removed, but that's for later.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Cc: Antonino A. Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/video/nvidia/nv_setup.c b/drivers/video/nvidia/nv_setup.c
index 82579d3..d9627b5 100644
--- a/drivers/video/nvidia/nv_setup.c
+++ b/drivers/video/nvidia/nv_setup.c
@@ -265,12 +265,12 @@
 
 	dev = pci_get_bus_and_slot(0, 1);
 	if ((par->Chipset & 0xffff) == 0x01a0) {
-		int amt = 0;
+		u32 amt;
 
 		pci_read_config_dword(dev, 0x7c, &amt);
 		par->RamAmountKBytes = (((amt >> 6) & 31) + 1) * 1024;
 	} else if ((par->Chipset & 0xffff) == 0x01f0) {
-		int amt = 0;
+		u32 amt;
 
 		pci_read_config_dword(dev, 0x84, &amt);
 		par->RamAmountKBytes = (((amt >> 4) & 127) + 1) * 1024;