[PATCH 2/3][mdadm] mdadm.h: bswap is already defined in uclibc

["Maxin B. John" <maxin.john@gmail.com>]

From: "Maxin B. John" <maxin.john@intel.com>

Fixes this build error:

| In file included from mdadm.c:28:0:
| mdadm.h:142:0: error: "bswap_16" redefined [-Werror]
|  #define bswap_16(x) (((x) & 0x00ffU) << 8 | \
|  ^

Signed-off-by: Maxin B. John <maxin.john@intel.com>
---
 mdadm.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/mdadm.h b/mdadm.h
index dd02be7..230e60f 100755
--- a/mdadm.h
+++ b/mdadm.h
@@ -139,12 +139,20 @@ struct dlm_lksb {
  * and there is no standard conversion function so... */
 /* And dietlibc doesn't think byteswap is ok, so.. */
 /*  #include <byteswap.h> */
+
+#ifndef bswap_16
 #define bswap_16(x) (((x) & 0x00ffU) << 8 | \
 		     ((x) & 0xff00U) >> 8)
+#endif
+
+#ifndef bswap_32
 #define bswap_32(x) (((x) & 0x000000ffU) << 24 | \
 		     ((x) & 0xff000000U) >> 24 | \
 		     ((x) & 0x0000ff00U) << 8  | \
 		     ((x) & 0x00ff0000U) >> 8)
+#endif
+
+#ifndef bswap_64
 #define bswap_64(x) (((x) & 0x00000000000000ffULL) << 56 | \
 		     ((x) & 0xff00000000000000ULL) >> 56 | \
 		     ((x) & 0x000000000000ff00ULL) << 40 | \
@@ -153,6 +161,7 @@ struct dlm_lksb {
 		     ((x) & 0x0000ff0000000000ULL) >> 24 | \
 		     ((x) & 0x00000000ff000000ULL) << 8 | \
 		     ((x) & 0x000000ff00000000ULL) >> 8)
+#endif
 
 #if !defined(__KLIBC__)
 #if BYTE_ORDER == LITTLE_ENDIAN
-- 
2.1.4