Fix for significant warning from 'R CMD check'

Signed-off-by: Stefan Widgren <stefan.widgren@gmail.com>

Author: stewid

src/libgit2/src/refs.c

@@ -232,7 +232,13 @@ int git_reference_lookup_resolved(
 		 nesting--)
 	{
 		if (nesting != max_nesting) {
-			strncpy(scan_name, ref->target.symbolic, sizeof(scan_name));
+                        /* Fix in git2r to handle a significant
+                           warning from 'R CMD check'
+                           libgit2/src/refs.c:235:4: warning:
+                           ‘strncpy’ specified bound 1024 equals
+                           destination size [-Wstringop-truncation] */
+			strncpy(scan_name, ref->target.symbolic, sizeof(scan_name) - 1);
+			/* strncpy(scan_name, ref->target.symbolic, sizeof(scan_name)); */
 			git_reference_free(ref);
 		}