Check errno rather than return from kmtIoctl in hsaKmtRuntimeEnable.

The return code is just -1 if any error occurs.  To detect debugger
unavailable we need to check the actual ioctl error code.

Change-Id: I8a294c754196aec916809497ec8e810da2f072b8
Signed-off-by: Sean Keely <Sean.Keely@amd.com>

src/debug.c

@@ -324,7 +324,7 @@ HSAKMT_STATUS HSAKMTAPI hsaKmtRuntimeEnable(void *rDebug,
 	long err = kmtIoctl(kfd_fd, AMDKFD_IOC_DBG_TRAP, &args);
 
 	if (err) {
-		if (err == EBUSY)
+		if (errno == EBUSY)
 			return HSAKMT_STATUS_UNAVAILABLE;
 		else
 			return HSAKMT_STATUS_ERROR;