vgdb, fix error print statement.

This patch fixes printing the first not delivered signal.

Signed-off-by: Carl Love <carll@us.ibm.com>

This bug was reported in bugzilla 335155.


git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13987 a5019735-40e9-0310-863c-91ae7b9d1cf9
Forgot to update NEWS file with bugzilla 335155 fix.



git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13988 a5019735-40e9-0310-863c-91ae7b9d1cf9