NDMP: fix missing slash on solaris NDMP between filesystem and path

When backing up the Filesystem /export/home on solaris, and
there is a directory regress, we got before:

 /export/homeregress/

and now we get:

 /export/home/regress/

src/dird/ndmp_fhdb_common.c

@@ -66,6 +66,13 @@ extern "C" int bndmp_fhdb_add_file(struct ndmlog *ixlog, int tagc, char *raw_nam
 
             pm_strcpy(pathname, nis->filesystem);
 
+            /*
+             * make sure we have a trailing slash
+             */
+            if ( pathname.c_str()[strlen(pathname.c_str()) - 1] != '/' ) {
+                pm_strcat(pathname, "/");
+            }
+
             /*
              * skip leading slash to avoid double slashes
              */