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Unused variable warnings #212

@evanmiller

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@evanmiller

When I compile with -Wall I get:

[ 15%] Building C object CMakeFiles/libminizip.dir/src/mz_strm_split.c.o
/Users/emiller/Code/WizardLibs/minizip/src/mz_strm_split.c:76:13: warning: unused variable 'read_disk_part' [-Wunused-variable]
    int16_t read_disk_part = 0;
            ^
1 warning generated.
[ 17%] Building C object CMakeFiles/libminizip.dir/src/mz_strm_zlib.c.o
[ 19%] Building C object CMakeFiles/libminizip.dir/src/mz_zip.c.o
/Users/emiller/Code/WizardLibs/minizip/src/mz_zip.c:854:16: warning: unused variable 'local_time' [-Wunused-variable]
    struct tm *local_time = NULL;
               ^
/Users/emiller/Code/WizardLibs/minizip/src/mz_zip.c:1601:14: warning: unused variable 'dos_date' [-Wunused-variable]
    uint32_t dos_date = 0;
             ^
2 warnings generated.
[ 21%] Building C object CMakeFiles/libminizip.dir/src/mz_os_posix.c.o
/Users/emiller/Code/WizardLibs/minizip/src/mz_os_posix.c:68:16: warning: unused variable 'filedate' [-Wunused-variable]
    struct tm *filedate = NULL;
               ^
/Users/emiller/Code/WizardLibs/minizip/src/mz_os_posix.c:71:12: warning: unused variable 'tm_t' [-Wunused-variable]
    time_t tm_t = 0;
           ^
2 warnings generated.
[ 23%] Building C object CMakeFiles/libminizip.dir/src/mz_strm_crypt.c.o
[ 26%] Building C object CMakeFiles/libminizip.dir/src/mz_strm_aes.c.o
/Users/emiller/Code/WizardLibs/minizip/src/mz_strm_aes.c:87:13: warning: unused variable 'err' [-Wunused-variable]
    int32_t err = MZ_OK;
            ^
1 warning generated.

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