[PATCH] qga: add channel path to error messages

["Bjørn Forsman" <bjorn.forsman@gmail.com>]

It's useful to know which device was used if/when it fails.

channel-win32.c had this since 2015, with
c69403fcd4a0cb89f838a212ab71e4a1a3464c95 ("qemu-ga: debug printouts to
help troubleshoot installation"), this brings channel-posix.c up to
speed.

Signed-off-by: Bjørn Forsman <bjorn.forsman@gmail.com>
---
 qga/channel-posix.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/qga/channel-posix.c b/qga/channel-posix.c
index 6796a02cff..e6dce985ae 100644
--- a/qga/channel-posix.c
+++ b/qga/channel-posix.c
@@ -138,7 +138,7 @@ static gboolean ga_channel_open(GAChannel *c, const gchar *path,
             0
         );
         if (fd == -1) {
-            error_setg_errno(errp, errno, "error opening channel");
+            error_setg_errno(errp, errno, "error opening channel '%s'", path);
             return false;
         }
 #ifdef CONFIG_SOLARIS
@@ -163,7 +163,7 @@ static gboolean ga_channel_open(GAChannel *c, const gchar *path,
         assert(fd < 0);
         fd = qga_open_cloexec(path, O_RDWR | O_NOCTTY | O_NONBLOCK, 0);
         if (fd == -1) {
-            error_setg_errno(errp, errno, "error opening channel");
+            error_setg_errno(errp, errno, "error opening channel '%s'", path);
             return false;
         }
         tcgetattr(fd, &tio);
-- 
2.36.2