Correct type of RECORD_LAYER_get_rrec_length()

The underlying field returned by RECORD_LAYER_get_rrec_length() is an
unsigned int. The return type of the function should match that.
Reviewed-by: NTim Hudson <tjh@openssl.org>

ssl/record/rec_layer_s3.c

@@ -1504,7 +1504,7 @@ int RECORD_LAYER_is_sslv2_record(RECORD_LAYER *rl)
 /*
  * Returns the length in bytes of the current rrec
  */
-int RECORD_LAYER_get_rrec_length(RECORD_LAYER *rl)
+unsigned int RECORD_LAYER_get_rrec_length(RECORD_LAYER *rl)
 {
     return SSL3_RECORD_get_length(&rl->rrec);
 }

ssl/record/record.h

@@ -326,7 +326,7 @@ void RECORD_LAYER_reset_read_sequence(RECORD_LAYER *rl);
 void RECORD_LAYER_reset_write_sequence(RECORD_LAYER *rl);
 int RECORD_LAYER_setup_comp_buffer(RECORD_LAYER *rl);
 int RECORD_LAYER_is_sslv2_record(RECORD_LAYER *rl);
-int RECORD_LAYER_get_rrec_length(RECORD_LAYER *rl);
+unsigned int RECORD_LAYER_get_rrec_length(RECORD_LAYER *rl);
 __owur int ssl3_pending(const SSL *s);
 __owur int ssl3_write_bytes(SSL *s, int type, const void *buf, int len);
 __owur int do_ssl3_write(SSL *s, int type, const unsigned char *buf,