[PATCH] Fix and improve comment in gdb_remote_download

[Simon Marchi <simon.marchi@ericsson.com>]

This patch fixes the current comment in gdb_remote_download, which is
false (the "except if that's already where it is" part).  It also
improves it, by explaining why pass TOFILE through standard_output_file,
even it is an absolute path.

gdb/testsuite/ChangeLog:

	* lib/gdb.exp (gdb_remote_download): Fix and extend comment.
---
 gdb/testsuite/lib/gdb.exp | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/gdb/testsuite/lib/gdb.exp b/gdb/testsuite/lib/gdb.exp
index 1ef6a96..0d8a3b0 100644
--- a/gdb/testsuite/lib/gdb.exp
+++ b/gdb/testsuite/lib/gdb.exp
@@ -4211,8 +4211,13 @@ proc gdb_remote_download {dest fromfile {tofile {}}} {
 
 	return $destname
     } else {
-	# When the DEST is local, we copy the file to the test directory
-	# (where the executable is), except if that's already where it is.
+	# When the DEST is local, we copy the file to the test directory (where
+	# the executable is).
+	#
+	# Note that we pass TOFILE through standard_output_file, regardless of
+	# whether it is absolute or relative, because we don't want the tests
+	# to be able to write outside their standard output directory.
+
 	set tofile [standard_output_file $tofile]
 
 	file copy -force $fromfile $tofile
-- 
2.8.1