Fixed compile error due to uninitialized variable.

third_party/mesa/MesaLib/src/egl/main/eglconfig.c

 /**
  * EGL Configuration (pixel format) functions.
  */
 
 
 #include <stdlib.h>
 #include <string.h>
 #include <assert.h>
 #include "eglconfig.h"
 #include "egldisplay.h"
@@ skipping 224 matching lines @@
    EGLint i, attr, val;
    EGLBoolean valid = EGL_TRUE;
    EGLint red_size = 0, green_size = 0, blue_size = 0, luminance_size = 0;
    EGLint alpha_size = 0, buffer_size = 0;
 
    /* all attributes should have been listed */
    assert(ARRAY_SIZE(_eglValidationTable) == _EGL_CONFIG_NUM_ATTRIBS);
 
    /* check attributes by their types */
    for (i = 0; i < ARRAY_SIZE(_eglValidationTable); i++) {
-      EGLint mask;
+      EGLint mask = 0;
 
       attr = _eglValidationTable[i].attr;
       val = GET_CONFIG_ATTRIB(conf, attr);
 
       switch (_eglValidationTable[i].type) {
       case ATTRIB_TYPE_INTEGER:
          switch (attr) {
          case EGL_CONFIG_ID:
             /* config id must be positive */
             if (val <= 0)
@@ skipping 572 matching lines @@
                EGLint config_size, EGLint *num_config)
 {
    if (!num_config)
       return _eglError(EGL_BAD_PARAMETER, "eglGetConfigs");
 
    *num_config = _eglFlattenArray(disp->Configs, (void *) configs,
          sizeof(configs[0]), config_size, _eglFlattenConfig);
 
    return EGL_TRUE;
 }