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tapefs: fix two warnings

--- a/sys/src/cmd/tapefs/cpiofs.c

+++ b/sys/src/cmd/tapefs/cpiofs.c

@@ -42,7 +42,9 @@

 {

 	ushort x;

-	return x = egetc(), x |= egetc()<<8;

+	x = egetc();

+	x |= egetc()<<8;

+	return x;

 }

 static ulong

@@ -50,7 +52,11 @@

 {

 	ulong x;

-	return x = egetc()<<16, x |= egetc()<<24, x |= egetc(), x |= egetc()<<8;

+	x = egetc()<<16;

+	x |= egetc()<<24;

+	x |= egetc();

+	x |= egetc()<<8;

+	return x;

 }

 /* sysvr3 and sysvr4 skip records with names longer than 256. pwb 1.0,