cmd/compile: remove more superfluous int(lineno) conversions

Change-Id: Ia3e5d62b9d38a6c356baec8eb88b2bdabff5820f
Reviewed-on: https://go-review.googlesource.com/20150
Reviewed-by: Brad Fitzpatrick <bradfitz@golang.org>
Reviewed-by: Matthew Dempsky <mdempsky@google.com>
Run-TryBot: Robert Griesemer <gri@golang.org>
diff --git a/src/cmd/compile/internal/gc/gen.go b/src/cmd/compile/internal/gc/gen.go
index 13fac83..92ee2ae 100644
--- a/src/cmd/compile/internal/gc/gen.go
+++ b/src/cmd/compile/internal/gc/gen.go
@@ -162,7 +162,7 @@
 		fs = fs.Link
 	}
 	if fs != to.Sym {
-		lno := int(lineno)
+		lno := lineno
 		setlineno(from)
 
 		// decide what to complain about.
@@ -196,7 +196,7 @@
 		} else {
 			Yyerror("goto %v jumps over declaration of %v at %v", from.Left.Sym, dcl, linestr(dcl.Lastlineno))
 		}
-		lineno = int32(lno)
+		lineno = lno
 	}
 }