*: Remove useless asserts

src/nvim/eval/decode.c

@@ -609,7 +609,6 @@ int json_decode_string(const char *const buf, const size_t buf_len,
     EMSG(_("E474: Attempt to decode a blank string"));
     return FAIL;
   }
-  assert(STRCMP(p_enc, "utf-8") == 0);
   int ret = OK;
   ValuesStack stack = KV_INITIAL_VALUE;
   ContainerStack container_stack = KV_INITIAL_VALUE;

src/nvim/eval/encode.c

@@ -564,7 +564,6 @@ static inline int convert_to_json_string(garray_T *const gap,
   } else {
     size_t utf_len = len;
     char *tofree = NULL;
-    assert(STRCMP(p_enc, "utf-8") == 0);
     size_t str_len = 0;
     // Encode character as \uNNNN if
     // 1. It is an ASCII control character (0x0 .. 0x1F; 0x7F not

src/nvim/shada.c

@@ -2920,8 +2920,6 @@ shada_write_file_nomerge: {}
     verbose_leave();
   }
 
-  assert(STRCMP(p_enc, "utf-8") == 0);
-
   const ShaDaWriteResult sw_ret = shada_write(&sd_writer, (nomerge
                                                            ? NULL
                                                            : &sd_reader));