bzip2.c (testStream): Remove set, but not used nread variable.

Modern GCC warns:

bzip2.c: In function ‘testStream’:
bzip2.c:557:37: warning: variable ‘nread’ set but not used
[-Wunused-but-set-variable]
    Int32   bzerr, bzerr_dummy, ret, nread, streamNo, i;
                                     ^~~~~

GCC is correct. In testStream we don't care about the number of bytes
read by BZ2_bzRead. So just remove the variable and the assignment.

1 files changed, 2 insertions, 2 deletions

diff --git a/bzip2.c b/bzip2.c
index 59f59ff..854a2bb 100644
--- a/bzip2.c
+++ b/bzip2.c
@@ -554,7 +554,7 @@ static
 Bool testStream ( FILE *zStream )
 {
    BZFILE* bzf = NULL;
-   Int32   bzerr, bzerr_dummy, ret, nread, streamNo, i;
+   Int32   bzerr, bzerr_dummy, ret, streamNo, i;
    UChar   obuf[5000];
    UChar   unused[BZ_MAX_UNUSED];
    Int32   nUnused;
@@ -577,7 +577,7 @@ Bool testStream ( FILE *zStream )
       streamNo++;
 
       while (bzerr == BZ_OK) {
-         nread = BZ2_bzRead ( &bzerr, bzf, obuf, 5000 );
+         BZ2_bzRead ( &bzerr, bzf, obuf, 5000 );
          if (bzerr == BZ_DATA_ERROR_MAGIC) goto errhandler;
       }
       if (bzerr != BZ_STREAM_END) goto errhandler;