(read_pem): Fixed c99-style declaration.

Reported by Henrik Grubbström.

Rev: src/nettle/tools/pkcs1-conv.c:1.2

tools/pkcs1-conv.c

@@ -186,9 +186,11 @@ read_pem(struct nettle_buffer *buffer, FILE *f,
   /* Find start line */
   for (;;)
     {
+      int res;
+
       nettle_buffer_reset(buffer);
 
-      int res = read_line(buffer, f);
+      res = read_line(buffer, f);
       if (res != 1)
 	return res;