gfxstream: Remove extra dispatch variable

... to addresss variable shadowing warnings and handle the 2 global
commands that do not require a dispatch.

Reviewed-by: Aaron Ruby <aruby@qnx.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/34418>

src/gfxstream/codegen/scripts/cereal/decoder.py

@@ -29,6 +29,11 @@ DELAYED_DECODER_DELETE_DICT_ENTRIES = [
     "vkDestroyShaderModule",
 ]
 
+GLOBAL_COMMANDS_WITHOUT_DISPATCH = [
+    "vkEnumerateInstanceExtensionProperties",
+    "vkEnumerateInstanceLayerProperties",
+]
+
 SNAPSHOT_API_CALL_INFO_VARNAME = "snapshotApiCallInfo"
 
 global_state_prefix = "m_state->on_"
@@ -338,7 +343,11 @@ def emit_dispatch_call(api, cgen):
         else:
             cgen.stmt("m_state->lock()")
 
-    cgen.vkApiCall(api, customPrefix="vk->", customParameters=customParams, \
+    whichDispatch = "vk->"
+    if api.name in GLOBAL_COMMANDS_WITHOUT_DISPATCH:
+        whichDispatch = "m_vk->"
+
+    cgen.vkApiCall(api, customPrefix=whichDispatch, customParameters=customParams, \
         globalStatePrefix=global_state_prefix, checkForDeviceLost=True,
         checkForOutOfMemory=True)
 
@@ -944,8 +953,6 @@ size_t VkDecoder::Impl::decode(void* buf, size_t len, IOStream* ioStream,
                 .build();
         """)
 
-        self.cgen.stmt("auto vk = m_vk")
-
         self.cgen.line("switch (opcode)")
         self.cgen.beginBlock()  # switch stmt