Fix build for GCC 4.7

Change-Id: I4e9265369174d82b55fd435bc47887972f99c9d4
eCryptfs: Fix payload_len unitialized variable warning

fs/ecryptfs/keystore.c: In function ‘ecryptfs_generate_key_packet_set’:
fs/ecryptfs/keystore.c:1168:28: warning: 'payload_len' may be used uninitialized

Change-Id: Ia64fbb5705eb61cb8136553040c27aed76527d8c
power-pm8xxx-ccadc-fix-compilation-warning

Change-Id: I365869151760a00419299a041ad9dab2dafc8ca0
Signed-off-by: Supreet Mysore Suresh <supreet@codeaurora.org>