Change return type of `dc_is_configured' to bool

deltachat-ffi/src/lib.rs

@@ -233,7 +233,7 @@ pub unsafe extern "C" fn dc_is_configured(context: *mut dc_context_t) -> libc::c
 
     let context = &*context;
 
-    configure::dc_is_configured(context)
+    configure::dc_is_configured(context) as libc::c_int
 }
 
 #[no_mangle]

src/configure/mod.rs

@@ -45,16 +45,16 @@ pub unsafe fn configure(context: &Context) {
 }
 
 /// Check if the context is already configured.
-pub fn dc_is_configured(context: &Context) -> libc::c_int {
+pub fn dc_is_configured(context: &Context) -> bool {
     if context
         .sql
         .get_config_int(context, "configured")
         .unwrap_or_default()
         > 0
     {
-        1
+        true
     } else {
-        0
+        false
     }
 }
 

src/dc_imex.rs

@@ -581,7 +581,7 @@ unsafe fn import_backup(context: &Context, backup_to_import: *const libc::c_char
             .map_or("<<None>>", |p| p.to_str().unwrap())
     );
 
-    if 0 != dc_is_configured(context) {
+    if dc_is_configured(context) {
         error!(context, 0, "Cannot import backups to accounts in use.");
         return 0;
     }