pem: auto add newlines to header/footer in mbedtls_pem_write_buffer()

Signed-off-by: Valerio Setti <valerio.setti@nordicsemi.no>
diff --git a/library/x509write_csr.c b/library/x509write_csr.c
index 4e39755..5ee683f 100644
--- a/library/x509write_csr.c
+++ b/library/x509write_csr.c
@@ -302,8 +302,8 @@
     return ret;
 }
 
-#define PEM_BEGIN_CSR           "-----BEGIN CERTIFICATE REQUEST-----\n"
-#define PEM_END_CSR             "-----END CERTIFICATE REQUEST-----\n"
+#define PEM_BEGIN_CSR           "-----BEGIN CERTIFICATE REQUEST-----"
+#define PEM_END_CSR             "-----END CERTIFICATE REQUEST-----"
 
 #if defined(MBEDTLS_PEM_WRITE_C)
 int mbedtls_x509write_csr_pem(mbedtls_x509write_csr *ctx, unsigned char *buf, size_t size,