[PATCH] open_istream: remove unneeded check for null pointer

[Stefan Beller <stefanbeller@googlemail.com>]

'st' is allocated via xmalloc a few lines before and passed to
the stream opening functions.
The xmalloc function is written in a way that either 'st' is allocated
valid memory or xmalloc already dies.
The function calls to open_istream_* do not change 'st', as the pointer is
passed by reference and not a pointer of a pointer.

Hence 'st' cannot be null at that part of the code.

Signed-off-by: Stefan Beller <stefanbeller@googlemail.com>
---
 streaming.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/streaming.c b/streaming.c
index acc07a6..debe904 100644
--- a/streaming.c
+++ b/streaming.c
@@ -144,17 +144,17 @@ struct git_istream *open_istream(const unsigned char *sha1,
 
 	st = xmalloc(sizeof(*st));
 	if (open_istream_tbl[src](st, &oi, real, type)) {
 		if (open_istream_incore(st, &oi, real, type)) {
 			free(st);
 			return NULL;
 		}
 	}
-	if (st && filter) {
+	if (filter) {
 		/* Add "&& !is_null_stream_filter(filter)" for performance */
 		struct git_istream *nst = attach_stream_filter(st, filter);
 		if (!nst)
 			close_istream(st);
 		st = nst;
 	}
 
 	*size = st->size;
-- 
1.8.3.3.1135.ge2c9e63