global: make 'char *path' const where possible

Signed-off-by: Christian Hesse <mail@eworm.de>
diff --git a/ui-repolist.c b/ui-repolist.c
index 41424c0..7cf7638 100644
--- a/ui-repolist.c
+++ b/ui-repolist.c
@@ -11,7 +11,7 @@
 #include "html.h"
 #include "ui-shared.h"
 
-static time_t read_agefile(char *path)
+static time_t read_agefile(const char *path)
 {
 	time_t result;
 	size_t size;