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/celt/vq.c b/celt/vq.c
index 1fac70e2..9462e7fa 100644
--- a/celt/vq.c
+++ b/celt/vq.c
@@ -214,7 +214,7 @@ opus_val16 op_pvq_search_c(celt_norm *X, int *iy, int K, int N, int arch)
       rcp = EXTRACT16(MULT16_32_Q16(K, celt_rcp(sum)));
 #else
       /* Using K+e with e < 1 guarantees we cannot get more than K pulses. */
-      rcp = EXTRACT16(MULT16_32_Q16(K+0.8, celt_rcp(sum)));
+      rcp = EXTRACT16(MULT16_32_Q16(K+0.8f, celt_rcp(sum)));
 #endif
       j=0; do {
 #ifdef FIXED_POINT