adb: do not mix printf() with write() when writing to stdout.

Change-Id: I3598cc951778080bec9a21d646656d5aba57120a
Signed-off-by: Mike Lockwood <lockwood@android.com>
diff --git a/commandline.c b/commandline.c
index 0352cf2..cd84c3a 100644
--- a/commandline.c
+++ b/commandline.c
@@ -221,8 +221,8 @@
             if(errno == EINTR) continue;
             break;
         }
-        /* we want to output to stdout, so no adb_write here !! */
-        unix_write(1, buf, len);
+        fwrite(buf, 1, len, stdout);
+        fflush(stdout);
     }
 }