Add a missing space to a printout.

Fix some warnings while we're at it.

Upstream patch https://github.com/the-tcpdump-group/tcpdump/commit/ca9a02c55e08560876cc318a7fdfcab9ce146eac

Change-Id: I450cca83a9e24672807a15ea6f3baa788379e3e5
diff --git a/print-isoclns.c b/print-isoclns.c
index 10f0be9..4536f65 100644
--- a/print-isoclns.c
+++ b/print-isoclns.c
@@ -3091,9 +3091,9 @@
             || length > ndo->ndo_snaplen
             || checksum_offset > ndo->ndo_snaplen
             || checksum_offset > length) {
-                ND_PRINT((ndo, "(unverified)"));
+                ND_PRINT((ndo, " (unverified)"));
         } else {
-                unsigned char *truncated = "trunc";
+                const char *truncated = "trunc";
 #if 0
                 printf("\nosi_print_cksum: %p %u %u %u\n", pptr, checksum_offset, length, ndo->ndo_snaplen);
                 ND_TCHECK2(pptr, checksum_offset+length);