kdb: kdb_support: mark expected switch fall-throughs

In preparation to enabling -Wimplicit-fallthrough, mark switch cases where we are expecting to fall through.

Notice that in this particular case, I replaced the code comments with a proper "fall through" annotation, which is what GCC is expecting to find.

Signed-off-by Gustavo A. R. Silva <[email protected]>

---
  kernel/debug/kdb/kdb_support.c | 6 +++---
  1 file changed, 3 insertions(+), 3 deletions(-)

kernel/debug/kdb/kdb_support.c +3 -3

index 990b3cc..89ac604 100644
@@ -432,7 +432,7 @@ int kdb_getphysword(unsigned long *word, unsigned long addr, size_t size)
  				*word = w8;
  			break;
  		}
-		/* drop through */
+		/* fall through */
  	default:
  		diag = KDB_BADWIDTH;
  		kdb_printf("kdb_getphysword: bad width %ld\n", (long) size);

@@ -481,7 +481,7 @@ int kdb_getword(unsigned long *word, unsigned long addr, size_t size)
  				*word = w8;
  			break;
  		}
-		/* drop through */
+		/* fall through */
  	default:
  		diag = KDB_BADWIDTH;
  		kdb_printf("kdb_getword: bad width %ld\n", (long) size);

@@ -525,7 +525,7 @@ int kdb_putword(unsigned long addr, unsigned long word, size_t size)
  			diag = kdb_putarea(addr, w8);
  			break;
  		}
-		/* drop through */
+		/* fall through */
  	default:
  		diag = KDB_BADWIDTH;
  		kdb_printf("kdb_putword: bad width %ld\n", (long) size);