Fix pcl-dls.1: free errPtr between calls in ptools_set_backend_file_dates()

char *errPtr was already used instead of char msgErr[1024], but was
not freed between the two ptools_backend_call() invocations. If the
first call allocated errPtr, the second would overwrite the pointer
without freeing it. Add free(errPtr); errPtr = NULL; between the two
calls to eliminate the leak.

Ref GH #194.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

pclsync/ptools.c

@@ -513,6 +513,12 @@ int ptools_set_backend_file_dates(uint64_t fileid, time_t ctime, time_t mtime) {
 
   pdbg_logf(D_NOTICE, "cTime res: [%d]", callRes);
 
+  /* Free errPtr before reuse to avoid leak if first call allocated it */
+  if (errPtr) {
+    free(errPtr);
+    errPtr = NULL;
+  }
+
   eventParams requiredParams = {5,
                                 {PAPI_STR("auth", psync_my_auth),
                                  PAPI_NUM("fileid", fileid),