blktap2: initialise buf to NULL in img2qcow.c:main

Gcc complains:

qcow2raw.c: In function ‘main’:
qcow2raw.c:387:17: error: ‘buf’ may be used uninitialized in this function [-Werror=maybe-uninitialized]
    treq.buf     = buf;
                 ^

But at the point of that assignment, buf is a valid buffer allocated by
posix_memalign and filled in by read.

Signed-off-by: Wei Liu <wei.liu2@citrix.com>
Reviewed-by: Doug Goldstein <cardoe@cardoe.com>
Release-acked-by: Wei Liu <wei.liu2@citrix.com>

diff --git a/tools/blktap2/drivers/img2qcow.c b/tools/blktap2/drivers/img2qcow.c
index 57b931e5516290c903562fa046abd3c488a2c9f5..7376382dcf93785911df4b6924cadd7dff84d3b4 100644 (file)
--- a/tools/blktap2/drivers/img2qcow.c
+++ b/tools/blktap2/drivers/img2qcow.c
@@ -166,7 +166,7 @@ int main(int argc, const char *argv[])
         int ret = -1, fd, len, err;
        struct timeval timeout;
        uint64_t i;
-       char *buf;
+       char *buf = NULL;
        td_request_t treq;
         td_disk_info_t info;
         td_vbd_request_t* vreq;