Description:
------------
Yaml.c zeroes just a pointer's worth of the state buffer instead of the whole 
thing.  It should use "sizeof(state)" instead of "sizeof(&state)".

Emit.c is passing an char* instead of an unsigned char* (aka yaml_char_t*) and 
needs an explicit cast.

Test script:
---------------
% phpize
% ./configure
% make

Expected result:
----------------
<no compilation warnings>

Actual result:
--------------
/Users/enolte/src/pecl/yaml/yaml.c:419:27: warning: argument to 'sizeof' in
      '__builtin___memset_chk' call is the same expression as the destination;
      did you mean to remove the addressof? [-Wsizeof-pointer-memaccess]
        memset(&state, 0, sizeof(&state));
        ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
/usr/include/secure/_string.h:77:41: note: expanded from macro 'memset'
   ? __builtin___memset_chk (dest, val, len, __darwin_obsz0 (dest))     \
                                        ^
/Users/enolte/src/pecl/yaml/yaml.c:509:27: warning: argument to 'sizeof' in
      '__builtin___memset_chk' call is the same expression as the destination;
      did you mean to remove the addressof? [-Wsizeof-pointer-memaccess]
        memset(&state, 0, sizeof(&state));
        ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
/usr/include/secure/_string.h:77:41: note: expanded from macro 'memset'
   ? __builtin___memset_chk (dest, val, len, __darwin_obsz0 (dest))     \
                                        ^
/Users/enolte/src/pecl/yaml/yaml.c:612:27: warning: argument to 'sizeof' in
      '__builtin___memset_chk' call is the same expression as the destination;
      did you mean to remove the addressof? [-Wsizeof-pointer-memaccess]
        memset(&state, 0, sizeof(&state));
        ~~~~~~~~~~~~~~~~~~~~~~~~~^~~~~~~~
/usr/include/secure/_string.h:77:41: note: expanded from macro 'memset'
   ? __builtin___memset_chk (dest, val, len, __darwin_obsz0 (dest))     \
                                        ^
3 warnings generated.


/Users/enolte/src/pecl/yaml/emit.c:749:39: warning: passing 'char *' to
      parameter of type 'yaml_char_t *' (aka 'unsigned char *') converts between
      pointers to integer types with different sign [-Wpointer-sign]
        return y_write_zval(state, (*zdata), Z_STRVAL_PP(ztag) TSRMLS_CC);
                                             ^~~~~~~~~~~~~~~~~
/opt/local/include/php/Zend/zend_operators.h:422:30: note: expanded from macro
      'Z_STRVAL_PP'
#define Z_STRVAL_PP(zval_pp)    Z_STRVAL(**zval_pp)
                                ^
/opt/local/include/php/Zend/zend_operators.h:392:26: note: expanded from macro
      'Z_STRVAL'
#define Z_STRVAL(zval)                  (zval).value.str.val
                                        ^~~~~~~~~~~~~~~~~~~~
/Users/enolte/src/pecl/yaml/emit.c:238:51: note: passing argument to parameter
      'tag' here
                y_emit_state_t *state, zval *data, yaml_char_t *tag TSRMLS_DC)
                                                                ^
1 warning generated.