Merge branch 'cxgb4-fix-build-error'

Rahul Lakkireddy says:

====================
cxgb4: fix build error

Patch 1 fixes build error with compiling cudbg_zlib.c when
CONFIG_ZLIB_DEFLATE macro is not defined.

Patch 2 fixes following sparse warning:
"Using plain integer as NULL pointer"
====================

Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/chelsio/Kconfig

···
 	depends on PCI && (IPV6 || IPV6=n)
 	select FW_LOADER
 	select MDIO
+	select ZLIB_DEFLATE
 	---help---
 	  This driver supports Chelsio T4, T5 & T6 based gigabit, 10Gb Ethernet
 	  adapter and T5/T6 based 40Gb and T6 based 25Gb, 50Gb and 100Gb

drivers/net/ethernet/chelsio/cxgb4/Makefile

···
 cxgb4-objs := cxgb4_main.o l2t.o smt.o t4_hw.o sge.o clip_tbl.o cxgb4_ethtool.o \
 	      cxgb4_uld.o sched.o cxgb4_filter.o cxgb4_tc_u32.o \
 	      cxgb4_ptp.o cxgb4_tc_flower.o cxgb4_cudbg.o \
-	      cudbg_common.o cudbg_lib.o
+	      cudbg_common.o cudbg_lib.o cudbg_zlib.o
 cxgb4-$(CONFIG_CHELSIO_T4_DCB) +=  cxgb4_dcb.o
 cxgb4-$(CONFIG_CHELSIO_T4_FCOE) +=  cxgb4_fcoe.o
 cxgb4-$(CONFIG_DEBUG_FS) += cxgb4_debugfs.o
-cxgb4-$(CONFIG_ZLIB_DEFLATE) += cudbg_zlib.o

drivers/net/ethernet/chelsio/cxgb4/cudbg_zlib.c

···
 			struct cudbg_buffer *pin_buff,
 			struct cudbg_buffer *pout_buff)
 {
-	struct z_stream_s compress_stream = { 0 };
 	struct cudbg_buffer temp_buff = { 0 };
+	struct z_stream_s compress_stream;
 	struct cudbg_compress_hdr *c_hdr;
 	int rc;
 
···
 	c_hdr = (struct cudbg_compress_hdr *)temp_buff.data;
 	c_hdr->compress_id = CUDBG_ZLIB_COMPRESS_ID;
 
+	memset(&compress_stream, 0, sizeof(struct z_stream_s));
 	compress_stream.workspace = pdbg_init->workspace;
 	rc = zlib_deflateInit2(&compress_stream, Z_DEFAULT_COMPRESSION,
 			       Z_DEFLATED, CUDBG_ZLIB_WIN_BITS,

drivers/net/ethernet/chelsio/cxgb4/cudbg_zlib.h

···
 
 static inline int cudbg_get_workspace_size(void)
 {
-#ifdef CONFIG_ZLIB_DEFLATE
 	return zlib_deflate_workspacesize(CUDBG_ZLIB_WIN_BITS,
 					  CUDBG_ZLIB_MEM_LVL);
-#else
-	return 0;
-#endif /* CONFIG_ZLIB_DEFLATE */
 }
 
-#ifndef CONFIG_ZLIB_DEFLATE
-static inline int cudbg_compress_buff(struct cudbg_init *pdbg_init,
-				      struct cudbg_buffer *pin_buff,
-				      struct cudbg_buffer *pout_buff)
-{
-	return 0;
-}
-#else
 int cudbg_compress_buff(struct cudbg_init *pdbg_init,
 			struct cudbg_buffer *pin_buff,
 			struct cudbg_buffer *pout_buff);
-#endif /* CONFIG_ZLIB_DEFLATE */
 #endif /* __CUDBG_ZLIB_H__ */

drivers/net/ethernet/chelsio/cxgb4/cxgb4_cudbg.c

···
 int cxgb4_cudbg_collect(struct adapter *adap, void *buf, u32 *buf_size,
 			u32 flag)
 {
-	struct cudbg_init cudbg_init = { 0 };
 	struct cudbg_buffer dbg_buff = { 0 };
 	u32 size, min_size, total_size = 0;
+	struct cudbg_init cudbg_init;
 	struct cudbg_hdr *cudbg_hdr;
 	int rc;
 
 	size = *buf_size;
 
+	memset(&cudbg_init, 0, sizeof(struct cudbg_init));
 	cudbg_init.adap = adap;
 	cudbg_init.outbuf = buf;
 	cudbg_init.outbuf_size = size;