Update NSPR to 4.12 and NSS to 3.23 on iOS

nspr/pr/src/io/prscanf.c

 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
 /* This Source Code Form is subject to the terms of the Mozilla Public
  * License, v. 2.0. If a copy of the MPL was not distributed with this
  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
 
 /*
  * Scan functions for NSPR types
  *
  * Author: Wan-Teh Chang
  *
@@ skipping 176 matching lines @@
  * (may be more than necessary) to represent a 64-bit integer or
  * floating point number.
  */
 #define FMAX 31
 #define DECIMAL_POINT '.'
 
 static PRStatus
 GetInt(ScanfState *state, int code)
 {
     char buf[FMAX + 1], *p;
-    int ch;
+    int ch = 0;
     static const char digits[] = "0123456789abcdefABCDEF";
     PRBool seenDigit = PR_FALSE;
     int base;
     int dlen;
 
     switch (code) {
         case 'd': case 'u':
             base = 10;
             break;
         case 'i':
@@ skipping 89 matching lines @@
         }
         state->converted = PR_TRUE;
     }
     return PR_SUCCESS;
 }
 
 static PRStatus
 GetFloat(ScanfState *state)
 {
     char buf[FMAX + 1], *p;
-    int ch;
+    int ch = 0;
     PRBool seenDigit = PR_FALSE;
 
     if (state->width == 0 || state->width > FMAX) {
         state->width = FMAX;
     }
     p = buf;
     GET_IF_WITHIN_WIDTH(state, ch);
     if (WITHIN_WIDTH(state) && (ch == '+' || ch == '-')) {
         *p++ = ch;
         GET_IF_WITHIN_WIDTH(state, ch);
@@ skipping 307 matching lines @@
     ScanfState state;
 
     state.get = &StringGetChar;
     state.unget = &StringUngetChar;
     state.stream = (void *) &buf;
     va_start(state.ap, fmt);
     rv = DoScanf(&state, fmt);
     va_end(state.ap);
     return rv;
 }