gRPC: RST_STREAM(NO_ERROR) handling micro-optimization.

After 2096b21fcd10, a single RST_STREAM(NO_ERROR) may not result in an error.
This change removes several unnecessary ctx->type checks for such a case.

src/http/modules/ngx_http_grpc_module.c

diff --git a/src/http/modules/ngx_http_grpc_module.c b/src/http/modules/ngx_http_grpc_module.c
index 42a540f..654bd17 100644
--- a/src/http/modules/ngx_http_grpc_module.c
+++ b/src/http/modules/ngx_http_grpc_module.c
@@ -2177,6 +2177,8 @@
             }
 
             ctx->rst = 1;
+
+            continue;
         }
 
         if (ctx->type == NGX_HTTP_V2_GOAWAY_FRAME) {
@@ -3484,6 +3486,8 @@
         return NGX_AGAIN;
     }
 
+    ctx->state = ngx_http_grpc_st_start;
+
     return NGX_OK;
 }