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webfs: faster shutdown using postnote()

when the 9p end is closed, post a note to our private note
group to shoot down http procs. this results in quicker
release of namespace resources.

--- a/sys/src/cmd/webfs/fs.c

+++ b/sys/src/cmd/webfs/fs.c

@@ -756,6 +756,13 @@

 		unmount(nil, mtpt);

 }

+static void

+fsend(Srv*)

+{

+	postnote(PNGROUP, getpid(), "shutdown");

+	exits(nil);

+}

+

 Srv fs = 

 {

 	.start=fsstart,

@@ -768,6 +775,7 @@

 	.write=fswrite,

 	.flush=fsflush,

 	.destroyfid=fsdestroyfid,

+	.end=fsend,

 };

 void

@@ -832,5 +840,5 @@

 	}

 	postmountsrv(&fs, service, mtpt, MREPL);

-	exits(0);

+	exits(nil);

 }

--- a/sys/src/cmd/webfs/http.c

+++ b/sys/src/cmd/webfs/http.c

@@ -240,7 +240,7 @@

 					/* free the tail */

 					hcloseall(x);

 				} while(i);

-				exits(0);

+				exits(nil);

 			}

 			return;

 		}

@@ -492,7 +492,7 @@

 static void

 catch(void *, char *msg)

 {

-	if(strstr("alarm", msg) || strstr("die", msg))

+	if(strstr("alarm", msg) != nil)

 		noted(NCONT);

 	else

 		noted(NDFLT);

@@ -710,7 +710,7 @@

 				}else

 					h->keep = 0;

 				if(pid == 0)

-					exits(0);

+					exits(nil);

 			}

 			/* no timeout when posting */

 			alarm(0);

@@ -1000,5 +1000,5 @@

 		shdr = k->next;

 		free(k);

 	}

-	exits(0);

+	exits(nil);

 }