[crc32] fix method signature (const pointer)

From: Stefan Bühler <stbuehler@web.de>

git-svn-id: svn://svn.lighttpd.net/lighttpd/branches/lighttpd-1.4.x@2984 152afb58-edef-0310-8abb-c4023f1b3aa9

src/crc32.c

@@ -70,7 +70,7 @@ static const unsigned int crc_c[256] = {
 };
 
 
-uint32_t generate_crc32c(char *buffer, size_t length) {
+uint32_t generate_crc32c(const char *buffer, size_t length) {
   size_t i;
   uint32_t crc32 = ~0L;
 

src/crc32.h

@@ -13,6 +13,6 @@
 # include <inttypes.h>
 #endif
 
-uint32_t generate_crc32c(char *string, size_t length);
+uint32_t generate_crc32c(const char *string, size_t length);
 
 #endif