Avoid GCC optimizations from injecting a call to memset(?) in order

to initialize the buffer array in ata_raid_attach() by removing the
initializer. There's no memset(?) in the kernel. Instead, assign
'\0' to the first element. The buffer array holds strings only, so
this is functionally equivalent.

Applies to: ia64
Tripped over by: tinderbox

sys/dev/ata/ata-raid.c

@@ -113,9 +113,10 @@ static disk_strategy_t ata_raid_strategy;
 static void
 ata_raid_attach(struct ar_softc *rdp, int writeback)
 {
-    char buffer[32] = {""};;
+    char buffer[32];
     int disk;
 
+    buffer[0] = '\0';
     mtx_init(&rdp->lock, "ATA PseudoRAID metadata lock", NULL, MTX_DEF);
     ata_raid_config_changed(rdp, writeback);