soup-form.c: change some code to make clang happy and to be more obvious
soup-form.c: change some code to make clang happy and to be more obvious

based on a suggestion from kov in
https://bugzilla.gnome.org/show_bug.cgi?id=605543

jwendell/libsoup,jwendell/libsoup,ahmedammar/platform_external_gst_libsoup,ahmedammar/platform_external_gst_libsoup,jwendell/libsoup,fanc999/libsoup,jwendell/libsoup,fanc999/libsoup,ahmedammar/platform_external_gst_libsoup,fanc999/libsoup,fanc999/libsoup,jwendell/libsoup,Distrotech/libsoup,Distrotech/libsoup,Distrotech/libsoup,fanc999/libsoup,Distrotech/libsoup,Distrotech/libsoup