s390/boot: do not check for zero-termination relocation entry

The relocation table is not expected to contain a zero-termination
entry. The existing check is likely a left-over from similar x86
code that uses zero-entries as delimiters. s390 does not have ones
and therefore the check could be avoided.
Suggested-by: Ilya Leoshkevich <iii@linux.ibm.com>
Acked-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
Acked-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Alexander Gordeev <agordeev@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>

arch/s390/boot/startup.c

@@ -200,9 +200,7 @@ static void kaslr_adjust_relocs(unsigned long min_addr, unsigned long max_addr,
 	long loc;
 
 	/* Adjust R_390_64 relocations */
-	for (reloc = vmlinux_relocs_64_start;
-		reloc < vmlinux_relocs_64_end && *reloc;
-		reloc++) {
+	for (reloc = vmlinux_relocs_64_start; reloc < vmlinux_relocs_64_end; reloc++) {
 		loc = (long)*reloc + offset;
 		if (loc < min_addr || loc > max_addr)
 			error("64-bit relocation outside of kernel!\n");