send-pull-request: fix a small typo that fails the script

(From OE-Core rev: 8a1266d49b9c23bfe3fb454f34524869ac9725b2)

Signed-off-by: Dexuan Cui <dexuan.cui@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/send-pull-request

@@ -73,7 +73,7 @@ while getopts "achp:t:" OPT; do
 	a)
 		AUTO_CL=1
 		# Fall through to include -c
-		;&
+		;;
 	c)
 		AUTO=1
 		GITSOBCC="--signed-off-by-cc"