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fswstat: can't modify automatic variables that get used in waseror() handler

--- a/kern/devfs-posix.c

+++ b/kern/devfs-posix.c

@@ -422,13 +422,13 @@

 		char *base, *newpath;

 		base = strdup(uif->path);

+		*lastelem(base) = 0;

+		newpath = catpath(base, d.name);

+		free(base);

 		if(waserror()){

-			free(base);

+			free(newpath);

 			nexterror();

 		}

-		*lastelem(base) = 0;

-		newpath = catpath(base, d.name);

-		free(base), base = newpath;

 		if(rename(uif->path, newpath) < 0)

 			error(strerror(errno));

 		free(uif->path);

--- a/kern/devfs-win32.c

+++ b/kern/devfs-win32.c

@@ -634,7 +634,12 @@

 			error(Ebadstat);

 		base[l] = 0;

 		newpath = catpath(base, d.name, nil);

-		free(base), base = newpath;

+		free(base);

+		poperror();

+		if(waserror()){

+			free(newpath);

+			nexterror();

+		}

 		if(wcscmp(uif->path, newpath)!=0){

 			if(!MoveFile(uif->path, newpath))

 				oserror();