[SPARC]: NULL noise removal from sparc floppy.h

Signed-off-by: David S. Miller <davem@davemloft.net>

include/asm-sparc/floppy.h

@@ -213,7 +213,7 @@ unsigned long pdma_size;
 volatile int doing_pdma = 0;
 
 /* This is software state */
-char *pdma_base = 0;
+char *pdma_base = NULL;
 unsigned long pdma_areasize;
 
 /* Common routines to all controller types on the Sparc. */