freedreno/ir3: Fix compiler warning from the setjmp fails path.

The TRY() macro doesn't call the contents if we fail to set up
setjmp/longjmp.

Fixes: 3d6e4a201a ("freedreno/decode: try harder to not crash in disasm")
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6323>

src/freedreno/ir3/disasm-a3xx.c

@@ -1709,7 +1709,7 @@ int disasm_a3xx(uint32_t *dwords, int sizedwords, int level, FILE *out, unsigned
 int try_disasm_a3xx(uint32_t *dwords, int sizedwords, int level, FILE *out, unsigned gpu_id)
 {
 	struct shader_stats stats;
-	int ret;
+	int ret = -1;
 	TRY(ret = disasm_a3xx_stat(dwords, sizedwords, level, out, gpu_id, &stats));
 	return ret;
 }