[S390] Fix sparse warnings.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/kernel/module.c b/arch/s390/kernel/module.c
index c271cda..d989ed4 100644
--- a/arch/s390/kernel/module.c
+++ b/arch/s390/kernel/module.c
@@ -119,7 +119,7 @@
 	int nrela, i, j;
 
 	/* Find symbol table and string table. */
-	symtab = 0;
+	symtab = NULL;
 	for (i = 0; i < hdr->e_shnum; i++)
 		switch (sechdrs[i].sh_type) {
 		case SHT_SYMTAB: