udf: convert UDF_SB_ALLOC_PARTMAPS macro to udf_sb_alloc_partition_maps function

- convert UDF_SB_ALLOC_PARTMAPS macro to udf_sb_alloc_partition_maps function
- convert kmalloc + memset to kcalloc
- check if kcalloc failed (partially)

Signed-off-by: Marcin Slusarz <marcin.slusarz@gmail.com>
Cc: Ben Fennema <bfennema@falcon.csc.calpoly.edu>
Cc: Jan Kara <jack@suse.cz>
Acked-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

fs/udf/udf_sb.h

@@ -43,19 +43,6 @@ static inline struct udf_sb_info *UDF_SB(struct super_block *sb)
 
 struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi);
 
-#define UDF_SB_ALLOC_PARTMAPS(X,Y)\
-{\
-	struct udf_sb_info *sbi = UDF_SB(X);\
-	sbi->s_partmaps = kmalloc(sizeof(struct udf_part_map) * Y, GFP_KERNEL);\
-	if (sbi->s_partmaps != NULL) {\
-		sbi->s_partitions = Y;\
-		memset(sbi->s_partmaps, 0x00, sizeof(struct udf_part_map) * Y);\
-	} else {\
-		sbi->s_partitions = 0;\
-		udf_error(X, __FUNCTION__, "Unable to allocate space for %d partition maps", Y);\
-	}\
-}
-
 #define UDF_SB_ALLOC_BITMAP(X,Y,Z)\
 {\
 	struct udf_sb_info *sbi = UDF_SB(X);\