api: Add error check

Add error check during tmpfile close.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Signed-off-by: Tigran Sogomonian <tsogomonian@astralinux.ru>

pkg/api/handlers/libpod/images.go

@@ -410,7 +410,10 @@ func ImagesImport(w http.ResponseWriter, r *http.Request) {
 			return
 		}
 
-		tmpfile.Close()
+		if err := tmpfile.Close(); err != nil {
+			utils.Error(w, http.StatusInternalServerError, fmt.Errorf("unable to close tempfile: %w", err))
+			return
+		}
 		source = tmpfile.Name()
 	}