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libmach: open /proc/n/kfpregs when kernel debugging

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

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

@@ -80,7 +80,7 @@

 Map*

 attachproc(int pid, int kflag, int corefd, Fhdr *fp)

 {

-	char buf[64], *regs;

+	char buf[64], *regs, *fpregs;

 	int fd;

 	Map *map;

 	uvlong n;

@@ -91,9 +91,11 @@

 		return 0;

 	if(kflag) {

 		regs = "kregs";

+		fpregs = "kfpregs";

 		mode = OREAD;

 	} else {

 		regs = "regs";

+		fpregs = "fpregs";

 		mode = ORDWR;

 	}

 	if (mach->regsize) {

@@ -106,7 +108,7 @@

 		setmap(map, fd, 0, mach->regsize, 0, "regs");

 	}

 	if (mach->fpregsize) {

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

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

 		fd = open(buf, mode);

 		if(fd < 0)

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