lima/gpir: clean up override-init warnings

Define gpir_op_unsupported as 0 so that we don't have to do the
initialization to -1.

Signed-off-by: Erico Nunes <nunes.erico@gmail.com>
Reviewed-by: Vasily Khoruzhick <anarsoul@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14894>

src/gallium/drivers/lima/ir/gp/gpir.h

@@ -32,6 +32,7 @@
 
 /* list of operations that a node can do. */
 typedef enum {
+   gpir_op_unsupported = 0,
    gpir_op_mov,
 
    /* mul ops */

src/gallium/drivers/lima/ir/gp/nir.c

@@ -147,9 +147,6 @@ static gpir_node *gpir_node_find(gpir_block *block, nir_src *src,
 }
 
 static int nir_to_gpir_opcodes[nir_num_opcodes] = {
-   /* not supported */
-   [0 ... nir_last_opcode] = -1,
-
    [nir_op_fmul] = gpir_op_mul,
    [nir_op_fadd] = gpir_op_add,
    [nir_op_fneg] = gpir_op_neg,
@@ -188,7 +185,7 @@ static bool gpir_emit_alu(gpir_block *block, nir_instr *ni)
 
    int op = nir_to_gpir_opcodes[instr->op];
 
-   if (op < 0) {
+   if (op == gpir_op_unsupported) {
       gpir_error("unsupported nir_op: %s\n", nir_op_infos[instr->op].name);
       return false;
    }

src/gallium/drivers/lima/ir/gp/node.c

@@ -28,6 +28,9 @@
 #include "gpir.h"
 
 const gpir_op_info gpir_op_infos[] = {
+   [gpir_op_unsupported] = {
+      .name = "unsupported",
+   },
    [gpir_op_mov] = {
       .name = "mov",
       .slots = (int []) {