Fix g_key_get_string() failure when string contains '['

In vd_agent/file_xfer.cpp is implemented a simple g_key_get_string,
but  when dragging a file with a name containing '[' (like te[st.txt),
it will fail.
From source code,
>next_group_pos = strstr(group_pos + strlen(group_pfx), "[");
>    if (next_group_pos && key_pos > next_group_pos) return false;
we know that it tries to find the end of current group by '[' label,
if we drag a file named te[st.txt, the key_string will be like:
[vdagent-file-xfer]
name=te[st.txt
size=10
so, it will fail when meta parsing and returns the
VD_AGENT_FILE_XFER_STATUS_ERROR message.

Here's the elegant method Christophe proposed and test ok, thanks to
him again!

1 files changed, 1 insertions, 1 deletions

diff --git a/vdagent/file_xfer.cpp b/vdagent/file_xfer.cpp
index 9eec5cc..208303f 100644
--- a/vdagent/file_xfer.cpp
+++ b/vdagent/file_xfer.cpp
@@ -206,7 +206,7 @@ bool FileXfer::g_key_get_string(char* data, const char* group, const char* key,
     snprintf(key_pfx, sizeof(key_pfx), "\n%s=", key);
     if (!(key_pos = strstr(group_pos, key_pfx))) return false;
 
-    next_group_pos = strstr(group_pos + strlen(group_pfx), "[");
+    next_group_pos = strstr(group_pos + strlen(group_pfx), "\n[");
     if (next_group_pos && key_pos > next_group_pos) return false;
 
     start = key_pos + strlen(key_pfx);