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sshfs: don't crash when no /etc/password file could be read on the remote side

in a cygwin environment, theres no /etc/passwd file to
translate numeric uid/gid's. changing passwdparse() to
ignore nil string argument.

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

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

@@ -1252,13 +1252,13 @@

 void

 passwdparse(IDEnt **tab, char *s)

 {

-	char *p;

-	char *n;

-	int id;

 	IDEnt *e, **b;

+	char *p, *n;

+	int id;

-	p = s;

-	for(;;){

+	if(s == nil)

+		return;

+	for(p = s;;){

 		n = p;

 		p = strpbrk(p, ":\n"); if(p == nil) break; if(*p != ':'){ p++; continue; }

 		*p = 0;