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import/expoerfs: dont assert() fault when ai->secret is > 8 bytes, just use the first 8 bytes

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

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

@@ -334,8 +334,9 @@

 		char fromserversecret[21];

 		int i;

-		assert(ai->nsecret <= sizeof(key)-4);

-		memmove(key+4, ai->secret, ai->nsecret);

+		if(ai->nsecret < 8)

+			fatal("secret too small for ssl");

+		memmove(key+4, ai->secret, 8);

 		/* exchange random numbers */

 		srand(truerand());

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

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

@@ -192,8 +192,9 @@

 		char fromserversecret[21];

 		int i;

-		assert(ai->nsecret <= sizeof(key)-4);

-		memmove(key+4, ai->secret, ai->nsecret);

+		if(ai->nsecret < 8)

+			sysfatal("secret too small to ssl");

+		memmove(key+4, ai->secret, 8);

 		/* exchange random numbers */

 		srand(truerand());