qemu-img: remove unused variable

Variable block_count used in img_dd function is only incremented but never read.
This causes 'Unused but set variable' warning on Clang 15.0.1 compiler.

Removing the variable to prevent the warning.

Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
Reviewed-by: Thomas Huth <thuth@redhat.com>
Message-Id: <e86d5b57f9d13bde995c616a533b876f1fb8a527.1668009030.git.mrezanin@redhat.com>
Signed-off-by: Thomas Huth <thuth@redhat.com>

qemu-img.c

@@ -4922,7 +4922,7 @@ static int img_dd(int argc, char **argv)
     const char *out_fmt = "raw";
     const char *fmt = NULL;
     int64_t size = 0;
-    int64_t block_count = 0, out_pos, in_pos;
+    int64_t out_pos, in_pos;
     bool force_share = false;
     struct DdInfo dd = {
         .flags = 0,
@@ -5122,7 +5122,7 @@ static int img_dd(int argc, char **argv)
 
     in.buf = g_new(uint8_t, in.bsz);
 
-    for (out_pos = 0; in_pos < size; block_count++) {
+    for (out_pos = 0; in_pos < size; ) {
         int bytes = (in_pos + in.bsz > size) ? size - in_pos : in.bsz;
 
         ret = blk_pread(blk1, in_pos, bytes, in.buf, 0);