Use guchar instead of char where the distinction is important.
Use guchar instead of char where the distinction is important.

Noticed by -Wextra

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