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page: print readimage error string

--- a/sys/src/cmd/page.c

+++ b/sys/src/cmd/page.c

@@ -772,7 +772,8 @@

 	if(p->open && p->image == nil){

 		if((fd = openpage(p)) >= 0){

 			pagegen++;

-			p->image = readimage(display, fd, 1);

+			if((p->image = readimage(display, fd, 1)) == nil)

+				fprint(2, "readimage: %r\n");

 			close(fd);

 		}

 		if(p->image == nil)

-- 

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