zlib: move EXPORT_SYMBOL() and MODULE_LICENSE() out of dfltcc_syms.c

In 11fb479 ("zlib: export S390 symbols for zlib modules"), I added
EXPORT_SYMBOL()s to dfltcc_inflate.c but then Mikhail said that these
should probably be in dfltcc_syms.c with the other EXPORT_SYMBOL()s.

However, that is contrary to the current kernel style, which places
EXPORT_SYMBOL() immediately after the function that it applies to,
so move all EXPORT_SYMBOL()s to their respective function locations
and drop the dfltcc_syms.c file. Also move MODULE_LICENSE() from the
deleted file to dfltcc.c.

Fixes: 11fb479 ("zlib: export S390 symbols for zlib modules")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Cc: Zaslonko Mikhail <zaslonko@linux.ibm.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Acked-by: Ilya Leoshkevich <iii@linux.ibm.com>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Cc: Christian Borntraeger <borntraeger@de.ibm.com>

lib/zlib_dfltcc/dfltcc.c

@@ -1,7 +1,8 @@
 // SPDX-License-Identifier: Zlib
 /* dfltcc.c - SystemZ DEFLATE CONVERSION CALL support. */
 
-#include <linux/zutil.h>
+#include <linux/export.h>
+#include <linux/module.h>
 #include "dfltcc_util.h"
 #include "dfltcc.h"
 
@@ -53,3 +54,6 @@ void dfltcc_reset(
     dfltcc_state->dht_threshold = DFLTCC_DHT_MIN_SAMPLE_SIZE;
     dfltcc_state->param.ribm = DFLTCC_RIBM;
 }
+EXPORT_SYMBOL(dfltcc_reset);
+
+MODULE_LICENSE("GPL");

lib/zlib_dfltcc/dfltcc_deflate.c

@@ -4,6 +4,7 @@
 #include "dfltcc_util.h"
 #include "dfltcc.h"
 #include <asm/setup.h>
+#include <linux/export.h>
 #include <linux/zutil.h>
 
 /*
@@ -34,6 +35,7 @@ int dfltcc_can_deflate(
 
     return 1;
 }
+EXPORT_SYMBOL(dfltcc_can_deflate);
 
 static void dfltcc_gdht(
     z_streamp strm
@@ -277,3 +279,4 @@ int dfltcc_deflate(
         goto again; /* deflate() must use all input or all output */
     return 1;
 }
+EXPORT_SYMBOL(dfltcc_deflate);