nasmlib.h: Add #undef for ZERO_BUF_SIZE

If we are redefining ZERO_BUF_SIZE, add an #undef to avoid nuisance
compiler warnings.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/nasmlib.h b/nasmlib.h
index dfce1dd9..24db5732 100644
--- a/nasmlib.h
+++ b/nasmlib.h
@@ -410,6 +410,7 @@ const char *prefix_name(int);
 
 #define ZERO_BUF_SIZE 4096      /* Default value */
 #if defined(BUFSIZ) && (BUFSIZ > ZERO_BUF_SIZE)
+# undef ZERO_BUF_SIZE
 # define ZERO_BUF_SIZE BUFSIZ
 #endif
 extern const uint8_t zero_buffer[ZERO_BUF_SIZE];