grc: fix flowgraph loading: update message ports keys
block: fix msg_passing/hier/ example
gr-fft-filter : Fix uninitialized pointers.

Address CID's 1043252 and 1043253. Inspection suggest the code should
work, but set the pointers to NULL to force errors on strange code
paths.

Signed-off-by: Philip Balister <philip@balister.org>
pfb-decimator : Fix leak.

Address CID 1046270.

Signed-off-by: Philip Balister <philip@balister.org>
Merge remote-tracking branch 'gnuradio-wg-grc/blocks_msg_example_fix' into maint
Merge branch 'maint'
Merge branch 'master' into next
runtime: Disable CPU_SET macros for FreeBSD.
qtgui: fixed thread-safety in GRC variable-type blocks
qtgui: fixed naming of classes for long-term use.
volk: clang sets GNUC_MINOR only to 2, so we need to check if we're building with clang. This patch enables xgetbv for clang >= 3.0.
volk: some versions of clang have problems with cvtpi32_ps.

We make a separate cmake check here for xgetbv and cvtpi32_ps and set definitions accordingly.
volk: test for clang version; if less than 3.2, disable SSE4a machine due to a bug in the compiler support.
filter: fixed an issue with filter delays for interp and rational_resampler filters.
analog: additional docs for noise sources.
cmake: If Ice 3.4 found, check version of GCC and disable if >= 4.7.
volk: modifying tests for AVX and SSE4a support in compiler/CPU.
grc: fix variable vlen for grc generated hier blocks
Merge branch 'maint'
Merge branch 'master' into next