rdoff: search_libraries - zeroify stack allocated structure

Coverity scan tool complains on rdffile::rdoff_ver member
being called with memcpy uninitialized. Lets zap this
structure explicitly once we've it allocated.

CID 1432931

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>

rdoff/ldrdf.c

@@ -606,6 +606,7 @@ static int search_libraries(void)
 
     cur = libraries;
 
+    memset(&f, 0, sizeof(f));
     while (cur) {
         if (options.verbose > 2)
             printf("scanning library `%s', pass %d...\n", cur->name, pass);