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lib9p: e*9p error tidy

sysfatal has consistent behavior regardless if the
user is threaded.

--- a/sys/src/lib9p/mem.c

+++ b/sys/src/lib9p/mem.c

@@ -9,10 +9,8 @@

 {

 	void *v;

-	if((v = malloc(sz)) == nil) {

-		fprint(2, "out of memory allocating %lud\n", sz);

-		exits("mem");

-	}

+	if((v = malloc(sz)) == nil)

+		sysfatal("out of memory allocating %lud", sz);

 	memset(v, 0, sz);

 	setmalloctag(v, getcallerpc(&sz));

 	return v;

@@ -23,10 +21,8 @@

 {

 	void *nv;

-	if((nv = realloc(v, sz)) == nil && sz != 0) {

-		fprint(2, "out of memory allocating %lud\n", sz);

-		exits("mem");

-	}

+	if((nv = realloc(v, sz)) == nil && sz != 0)

+		sysfatal("out of memory allocating %lud", sz);

 	if(v == nil)

 		setmalloctag(nv, getcallerpc(&v));

 	setrealloctag(nv, getcallerpc(&v));

@@ -38,10 +34,8 @@

 {

 	char *t;

-	if((t = strdup(s)) == nil) {

-		fprint(2, "out of memory in strdup(%.10s)\n", s);

-		exits("mem");

-	}

+	if((t = strdup(s)) == nil)

+		sysfatal("out of memory in strdup(%.10s)", s);

 	setmalloctag(t, getcallerpc(&s));

 	return t;

 }

--- a/sys/src/lib9p/srv.c

+++ b/sys/src/lib9p/srv.c

@@ -666,10 +666,6 @@

 	}

 	n = GBIT16(tmp)+BIT16SZ;

 	statbuf = emalloc9p(n);

-	if(statbuf == nil){

-		r->error = "out of memory";

-		return;

-	}

 	r->ofcall.nstat = convD2M(&r->d, statbuf, n);

 	r->ofcall.stat = statbuf;	/* freed in closereq */

 	if(r->ofcall.nstat <= BIT16SZ){