Fix compiler warnings

- celt/modes.c:430:14: warning: cast from 'const unsigned char *' to
  'opus_int16 *' increases required alignment from 1 to 2 [-Wcast-align]
- 'C[0][1]' may be used uninitialized [-Wmaybe-uninitialized]
- Unused variable/parameter
- Value stored is never read
- MSVC warnings about "possible loss of data" due to type conversions
- MSVC warning C4146: unary minus operator applied to unsigned type
- silk/NLSF_del_dec_quant.c:137:20: warning: array subscript is above
  array bounds [-Warray-bounds] (gcc -O3 false positive)
- src/mlp_train.h:39:20: warning: function declaration isn't a prototype
  [-Wstrict-prototypes]
- Remove SMALL_FOOTPRINT code from SSE 4.1 FIR implementation, matching
  the C implementation.

The clang -Wcast-align warnings with SSE intrinsics are a known
clang issue: https://llvm.org/bugs/show_bug.cgi?id=20670

1 files changed, 1 insertions, 1 deletions

diff --git a/src/opus.c b/src/opus.c
index f76f125c..cdbd13a1 100644
--- a/src/opus.c
+++ b/src/opus.c
@@ -107,7 +107,7 @@ OPUS_EXPORT void opus_pcm_soft_clip(float *_x, int N, int C, float *declip_mem)
          /* Slightly boost "a" by 2^-22. This is just enough to ensure -ffast-math
             does not cause output values larger than +/-1, but small enough not
             to matter even for 24-bit output.  */
-         a += a*2.4e-7;
+         a += a*2.4e-7f;
          if (x[i*C]>0)
             a = -a;
          /* Apply soft clipping */