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libmach: substitute /dev/zero for /proc/$pid/fpregs when missing (for snapfs)

--- a/sys/src/libmach/map.c

+++ b/sys/src/libmach/map.c

@@ -108,11 +108,8 @@

 	if (mach->fpregsize) {

 		sprint(buf, "/proc/%d/fpregs", pid);

 		fd = open(buf, mode);

-		if(fd < 0) {

-			close(map->seg[0].fd);

-			free(map);

-			return 0;

-		}

+		if(fd < 0)

+			fd = open("/dev/zero", OREAD);

 		setmap(map, fd, mach->regsize, mach->regsize+mach->fpregsize, 0, "fpregs");

 	}

 	setmap(map, corefd, fp->txtaddr, fp->txtaddr+fp->txtsz, fp->txtaddr, "text");