[Bug 214382] Kernel compilation error when gzip device enabled

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=214382

            Bug ID: 214382
           Summary: Kernel compilation error when gzip device enabled
           Product: Base System
           Version: 11.0-STABLE
          Hardware: amd64
                OS: Any
            Status: New
          Severity: Affects Some People
          Priority: ---
         Component: kern
          Assignee: freebsd-bugs at FreeBSD.org
          Reporter: kpect at protonmail.com
                CC: freebsd-amd64 at FreeBSD.org
                CC: freebsd-amd64 at FreeBSD.org

Hello.

When compile with gzip option enabled in kernel config
device          gzip
I get following error:

cc  -c -O2 -pipe -fno-strict-aliasing -march=ivybridge  -nostdinc  -I.
-I/usr/src/sys -I/usr/src/sys/contrib/libfdt -D_KERNEL
-DHAVE_KERNEL_OPTION_HEADERS -include opt_global.h   -mcmodel=kernel
-mno-red-zone -mno-mmx -mno-sse -msoft-float  -fno-asynchronous-unwind-tables
-ffreestanding -fwrapv -fstack-protector -Wall -Wredundant-decls
-Wnested-externs -Wstrict-prototypes  -Wmissing-prototypes -Wpointer-arith
-Winline -Wcast-qual  -Wundef -Wno-pointer-sign -Wno-format 
-Wmissing-include-dirs -fdiagnostics-show-option  -Wno-unknown-pragmas 
-Wno-error-tautological-compare -Wno-error-empty-body 
-Wno-error-parentheses-equality -Wno-error-unused-function 
-Wno-error-pointer-sign -Wno-error-shift-negative-value  -mno-aes -mno-avx 
-std=iso9899:1999 -Werror  vers.c
linking kernel
inflate.o: In function `inflateGetHeader':
/usr/src/sys/cddl/contrib/opensolaris/uts/common/zmod/inflate.c:(.text+0x2010):
multiple definition of `inflateGetHeader'
inflate.o:/usr/src/sys/cddl/contrib/opensolaris/uts/common/zmod/inflate.c:(.text+0x2010):
first defined here
inflate.o: In function `inflatePrime':
/usr/src/sys/cddl/contrib/opensolaris/uts/common/zmod/inflate.c:(.text+0xb0):
multiple definition of `inflatePrime'
inflate.o:/usr/src/sys/cddl/contrib/opensolaris/uts/common/zmod/inflate.c:(.text+0xb0):
first defined here
inflate.o: In function `z_inflate':
...

# uname -a
FreeBSD KPECT 11.0-STABLE FreeBSD 11.0-STABLE #0: Fri Nov  4 10:52:46 UTC 2016 
   root at KPECT  amd64

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