cmake: fix `fish` install directory detection via `pkg-config`

Follow-up to c8b0f0c9ad78eafc6c8f0005113de346ee797c21 #16833

Closes #17147

diff --git a/scripts/CMakeLists.txt b/scripts/CMakeLists.txt
index 95a01b50683a5aeff2495da7f8c04326e6a6271d..a627184e45e5a807571a3547ad827c87a7977538 100644 (file)
--- a/scripts/CMakeLists.txt
+++ b/scripts/CMakeLists.txt
@@ -56,7 +56,7 @@ if(CURL_COMPLETION_FISH OR
           if(NOT CURL_COMPLETION_FISH_DIR)
             find_package(PkgConfig QUIET)
             pkg_get_variable(CURL_COMPLETION_FISH_DIR "fish" "completionsdir")
-            if(NOT _pkg_fish_completionsdir)
+            if(NOT CURL_COMPLETION_FISH_DIR)
               if(CMAKE_INSTALL_DATAROOTDIR)
                 set(CURL_COMPLETION_FISH_DIR "${CMAKE_INSTALL_DATAROOTDIR}/fish/vendor_completions.d")
               endif()