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libauthsrv: authdial smprint() out of memory autism

--- a/sys/src/libauthsrv/authdial.c

+++ b/sys/src/libauthsrv/authdial.c

@@ -28,6 +28,8 @@

 	 */

 	if(p == nil) {

 		p = smprint("p9auth.%s", dom);

+		if(p == nil)

+			return -1;

 		t = ndbnew("auth", p);

 	}

 	free(p);

-- 

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