[PATCH] Fix ppc32 zImage inflate

The recent zlib update (commit 4f3865fb)
broke ppc32 zImage decompression as it tries to decompress to address zero
and the updated zlib_inflate checks that strm->next_out isn't a null
pointer.

This little patch fixes it.

[rpurdie@rpsys.net: add comment]
Signed-off-by: NPeter Korsgaard <jacmet@sunsite.dk>
Acked-by: NTom Rini <trini@kernel.crashing.org>
Signed-off-by: NRichard Purdie <rpurdie@rpsys.net>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

lib/zlib_inflate/inflate.c

@@ -347,7 +347,10 @@ int zlib_inflate(z_streamp strm, int flush)
     static const unsigned short order[19] = /* permutation of code lengths */
         {16, 17, 18, 0, 8, 7, 9, 6, 10, 5, 11, 4, 12, 3, 13, 2, 14, 1, 15};
 
-    if (strm == NULL || strm->state == NULL || strm->next_out == NULL ||
+    /* Do not check for strm->next_out == NULL here as ppc zImage
+       inflates to strm->next_out = 0 */
+
+    if (strm == NULL || strm->state == NULL ||
         (strm->next_in == NULL && strm->avail_in != 0))
         return Z_STREAM_ERROR;