Wasm: Re-add a removed 'const' qualifier in nxt_rt_wasmtime.c.

This was inadvertently removed in 76086d6 ("Wasm: Allow to set the HTTP
response status.")

Fixes: 76086d6 ("Wasm: Allow to set the HTTP response status.")
Signed-off-by: Andrew Clayton <[email protected]>

Author: ac000

src/wasm/nxt_rt_wasmtime.c

@@ -137,7 +137,7 @@ nxt_wasmtime_execute_hook(const nxt_wasm_ctx_t *ctx, nxt_wasm_fh_t hook)
 
 
 static int
-nxt_wasmtime_execute_request(nxt_wasm_ctx_t *ctx)
+nxt_wasmtime_execute_request(const nxt_wasm_ctx_t *ctx)
 {
     int                    i = 0;
     wasm_trap_t            *trap = NULL;

src/wasm/nxt_wasm.h

@@ -127,7 +127,7 @@ struct nxt_wasm_ctx_s {
 struct nxt_wasm_operations_s {
     int   (*init)(nxt_wasm_ctx_t *ctx);
     void  (*destroy)(const nxt_wasm_ctx_t *ctx);
-    int   (*exec_request)(nxt_wasm_ctx_t *ctx);
+    int   (*exec_request)(const nxt_wasm_ctx_t *ctx);
     void  (*exec_hook)(const nxt_wasm_ctx_t *ctx, nxt_wasm_fh_t hook);
 };