Remove redundant variable

Signed-off-by: Przemek Stekiel <przemyslaw.stekiel@mobica.com>
diff --git a/library/x509write_csr.c b/library/x509write_csr.c
index 68930b6..c0fe0a8 100644
--- a/library/x509write_csr.c
+++ b/library/x509write_csr.c
@@ -89,7 +89,6 @@
                                                        const mbedtls_x509_san_list *san_list)
 {
     int ret = 0;
-    size_t sandeep = 0;
     const mbedtls_x509_san_list *cur = san_list;
     unsigned char *buf;
     unsigned char *p;