Changes from 2.17.0 to 2.17.1

Several fixes affecting uninitialized memory access and others:

• Fix uninitialized memory access in newly added unshuffle12_sse2 and unshuffle12_avx2 functions
• Fix unaligned access in sw32 and sw32
• Fix DWORD being printed as %s in sprintf call
• Fix warning on unused variable (since this variable was only being used in the linux branch)
• splitmode variable was uninitialized if goto was triggered

See PR #658. Many thanks to @EmilDohne for this nice job.