fix: invalid position when missing EOL (#5279)

Author: ldez

pkg/goanalysis/position.go

@@ -37,7 +37,7 @@ func GetFilePositionFor(fset *token.FileSet, p token.Pos) token.Position {
 func EndOfLinePos(f *token.File, line int) token.Pos {
 	var end token.Pos
 
-	if line == f.LineCount() {
+	if line >= f.LineCount() {
 		// missing newline at the end of the file
 		end = f.Pos(f.Size())
 	} else {

pkg/golinters/gofumpt/testdata/gofumpt.go

@@ -5,4 +5,4 @@ import "fmt"
 
 func GofumptNewLine() {
 	fmt.Println( "foo" ) // want "File is not properly formatted"
-}
+} // want "File is not properly formatted"