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disk/mkext: fix nil dereference in arg parsing

--- a/sys/src/cmd/disk/mkext.c

+++ b/sys/src/cmd/disk/mkext.c

@@ -39,7 +39,7 @@

 	namep = name;

 	ARGBEGIN{

 	case 'd':

-		p = ARGF();

+		p = EARGF(usage());

 		if(strlen(p) >= LEN)

 			error("destination fs name too long\n");

 		strcpy(name, p);