tools/nxstyle: check alignment of statements without a leading keyword

[raiden00pl]

Summary

Only lines beginning with a C keyword were checked, so an assignment or a call could sit at any column.

Impact

nuttx coding standard compatibility

Testing

detect wrong alignment like below:

int demo(int a, int b)
{
  int x;

  x = a + b;
    x = x * 2;                                         // <<< not detected
  printf("%d\n", x);
      printf("hello\n");                               // <<< not detecetd
  if (x > 0)
    {
      x--;
        x++;                                           // << not detected
    }

  return x;
}

[github-actions]

MemBrowse Memory Report

No memory changes detected for:

• arduino-mega2560
• esp32-devkitc
• hifive1-revb
• mirtoo
• qemu-armv8a
• qemu-intel64
• rx65n-rsk2mb
• s698pm-dkit
• stm32-nucleo-f103rb