[libsoup] Meson: Fix typo when using libxml2 library without a pkg-config

[Tomas Popela <tpopela src gnome org>]

commit 4c78ce9fa988fa46e148e55eded75c66f9a8377d
Author: Xavier Claessens <xavier claessens collabora com>
Date:   Fri Dec 7 11:27:54 2018 -0500

    Meson: Fix typo when using libxml2 library without a pkg-config

 meson.build | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
---
diff --git a/meson.build b/meson.build
index f3337dc0..74187d49 100644
--- a/meson.build
+++ b/meson.build
@@ -78,7 +78,7 @@ if not libxml_dep.found()
   # Note: The XML include dir needs to be within the INCLUDE envvar,
   # such as <INCLUDEDIR>\libxml2
   cc.has_header('libxml/tree.h')
-  libxml2_dep = cc.find_library('xml2')
+  libxml_dep = cc.find_library('xml2')
 endif
 
 cdata = configuration_data()