r600/shader: Fix all warnings issed with "-Wall -Wextra"

- fix a number of -Wsign-compare warnings
- fix two warnings for -Woverride-init because TGSI_OPCODE_CEIL == 83, and
  the according field was defined two times.

[airlied: don't use -1 with unsigned type,
fix whitespace]

Signed-off-by: Gert Wollny <gw.fossdev@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
1 file changed