size_t for buffer functions.

Change BUF_MEM_grow and BUF_MEM_grow_clean to return size_t.
Reviewed-by: NRichard Levitte <levitte@openssl.org>

crypto/bio/bss_mem.c

@@ -187,7 +187,7 @@ static int mem_write(BIO *b, const char *in, int inl)
 
     BIO_clear_retry_flags(b);
     blen = bm->length;
-    if (BUF_MEM_grow_clean(bm, blen + inl) != (blen + inl))
+    if (BUF_MEM_grow_clean(bm, blen + inl) == 0)
         goto end;
     memcpy(&(bm->data[blen]), in, inl);
     ret = inl;

crypto/buffer/buffer.c

@@ -94,7 +94,7 @@ void BUF_MEM_free(BUF_MEM *a)
     OPENSSL_free(a);
 }
 
-int BUF_MEM_grow(BUF_MEM *str, size_t len)
+size_t BUF_MEM_grow(BUF_MEM *str, size_t len)
 {
     char *ret;
     size_t n;
@@ -130,7 +130,7 @@ int BUF_MEM_grow(BUF_MEM *str, size_t len)
     return (len);
 }
 
-int BUF_MEM_grow_clean(BUF_MEM *str, size_t len)
+size_t BUF_MEM_grow_clean(BUF_MEM *str, size_t len)
 {
     char *ret;
     size_t n;

crypto/buffer/buffer.h

@@ -82,8 +82,8 @@ struct buf_mem_st {
 
 BUF_MEM *BUF_MEM_new(void);
 void BUF_MEM_free(BUF_MEM *a);
-int BUF_MEM_grow(BUF_MEM *str, size_t len);
-int BUF_MEM_grow_clean(BUF_MEM *str, size_t len);
+size_t BUF_MEM_grow(BUF_MEM *str, size_t len);
+size_t BUF_MEM_grow_clean(BUF_MEM *str, size_t len);
 size_t BUF_strnlen(const char *str, size_t maxlen);
 char *BUF_strdup(const char *str);
 char *BUF_strndup(const char *str, size_t siz);