cmd/compile/internal/gc: remove dead code found by vet

See report in commit 3c9fa388df826a67cb5042513e3df079709e6b8b.

Change-Id: I74a5995a1c1ca62b8d01857e89b084502e7da928
Reviewed-on: https://go-review.googlesource.com/14170
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
diff --git a/src/cmd/compile/internal/gc/gen.go b/src/cmd/compile/internal/gc/gen.go
index 4e03012..1e9c68c 100644
--- a/src/cmd/compile/internal/gc/gen.go
+++ b/src/cmd/compile/internal/gc/gen.go
@@ -1220,7 +1220,6 @@
 	case TINTER:
 		return f(itable, startOffset) &&
 			f(Ptrto(Types[TUINT8]), startOffset+int64(Widthptr))
-		return true
 
 	case TSTRING:
 		return f(Ptrto(Types[TUINT8]), startOffset) &&