Fix two truncation bugs in harfbuzz-indic shaper.

third_party/harfbuzz/contrib/harfbuzz-unicode.c

 #include <stdint.h>
 #include <stdlib.h>
 
 #include <harfbuzz-external.h>
 #include <harfbuzz-impl.h>
 #include <harfbuzz-shaper.h>
 #include "harfbuzz-unicode.h"
 
 #include "tables/grapheme-break-properties.h"
 #include "tables/mirroring-properties.h"
@@ skipping 96 matching lines @@
     if (*iter == len)
       break;
     const ssize_t prev_iter = *iter;
     const uint32_t cp = utf16_to_code_point(chars, len, iter);
     if (cp == HB_InvalidCodePoint)
       return 0;
     cps++;
     const HB_Script script = code_point_to_script(cp);
 
     if (script != current_script) {
-      if (current_script == init_script == HB_Script_Inherited) {
+      if (current_script == HB_Script_Inherited && init_script == HB_Script_Inherited) {
         // If we started off as inherited, we take whatever we can find.
         output->script = script;
         current_script = script;
         continue;
       } else if (script == HB_Script_Inherited) {
         continue;
       } else {
         *iter = prev_iter;
         cps--;
         break;
@@ skipping 133 matching lines @@
     return ch;
 
   return ((const struct mirroring_property *) mprop)->b;
 }
 
 void *
 HB_Library_Resolve(const char *library, int version, const char *symbol) {
   abort();
   return NULL;
 }