S5276: Fix false-positives when using "-fshort-enums"

typedef enum {
  enum_value_0 = 0,
  enum_value_1
} short_enum_t;

int func(unsigned char p)
{
  return p;
}

int main(void)
{
  short_enum_t val = enum_value_1;
  return func(val); // <-- code smell, implicit conversion loses integer precision: 'short_enum_t' to 'uint8_t' (aka 'unsigned char')
}