Add missing function prototype.

This resolves issue #17.

Signed-off-by: Slávek Banko <slavek.banko@axis.cz>

kernel/kls_ljpeg/ljpeg2ppm/huffd.c

@@ -48,6 +48,9 @@
 
 #define RST0    0xD0	/* RST0 marker code */
 
+/* defined in util.c */
+void FixHuffTbl(HuffmanTable *);
+
 static long getBuffer;		/* current bit-extraction buffer */
 static int bitsLeft;		/* # of unused bits in it */