cleanup darshan-util compiler warnings

darshan-util/darshan-logutils.c

@@ -1915,7 +1915,7 @@ void darshan_log_get_name_records(darshan_fd fd,
     if(ret < 0)
     {
         darshan_log_close(fd);
-        return(-1);
+        return;
     }
 
     int num = HASH_CNT(hlink, name_hash);

darshan-util/darshan-logutils.h

@@ -70,7 +70,7 @@ struct darshan_mnt_info
 
 struct darshan_mod_info
 {
-    char *name;
+    const char *name;
     int  len;
     int  ver;
     int  idx;