Fix bug. It must be unsigned.

Before:
000906e9 (06-ffffff9e-09)

After:
000906e9 (06-9e-09)

cpuid.c

@@ -32,9 +32,9 @@ int main(int argc, char * argv[])
 {
 	unsigned int id = cpuid(1);
 
-	char step = (id) & 0x0000000f;
-	char model = (((id >> 16) & 0x000000ff) << 4) | ((id >> 4) & 0x0000000f);
-	char family = (((id >> 20) & 0x000000ff) << 4) | ((id >> 8) & 0x0000000f);
+	unsigned char step = (id) & 0x0000000f;
+	unsigned char model = (((id >> 16) & 0x000000ff) << 4) | ((id >> 4) & 0x0000000f);
+	unsigned char family = (((id >> 20) & 0x000000ff) << 4) | ((id >> 8) & 0x0000000f);
 
 	printf("%08x (%02x-%02x-%02x)", id, family, model, step);