[libsoup] soup-message-headers: Add sanity check into content_type_setter()

[Milan Crha <mcrha src gnome org>]

commit ef10fc84788962239567b564806427e84548c2b8
Author: Milan Crha <mcrha redhat com>
Date:   Mon Jun 25 18:15:00 2018 +0200

    soup-message-headers: Add sanity check into content_type_setter()
    
    To address a Coverity Scan/clang warning.
    
    https://bugzilla.gnome.org/show_bug.cgi?id=781771

 libsoup/soup-message-headers.c | 14 ++++++++------
 1 file changed, 8 insertions(+), 6 deletions(-)
---
diff --git a/libsoup/soup-message-headers.c b/libsoup/soup-message-headers.c
index 16e487af..7522702a 100644
--- a/libsoup/soup-message-headers.c
+++ b/libsoup/soup-message-headers.c
@@ -1324,18 +1324,20 @@ static void
 content_type_setter (SoupMessageHeaders *hdrs, const char *value)
 {
        g_free (hdrs->content_type);
+       hdrs->content_type = NULL;
+
        if (value) {
-               char *content_type, *p;
+               char *content_type = NULL, *p;
 
                parse_content_foo (hdrs, "Content-Type", &content_type, NULL);
+               g_return_if_fail (content_type != NULL);
+
                p = strpbrk (content_type, " /");
-               if (!p || *p != '/' || strpbrk (p + 1, " /")) {
+               if (!p || *p != '/' || strpbrk (p + 1, " /"))
                        g_free (content_type);
-                       hdrs->content_type = NULL;
-               } else
+               else
                        hdrs->content_type = content_type;
-       } else
-               hdrs->content_type = NULL;
+       }
 }
 
 /**