Give match data memory failur in regcomp() instead of regexec()

ChangeLog

@@ -293,6 +293,9 @@ a factor of the size of the compiling workspace (it currently is).
 86. Avoid the possibility of computing with an out-of-bounds pointer (though 
 not dereferencing it) while handling lookbehind assertions.
 
+87. Failure to get memory for the match data in regcomp() is now given as a 
+regcomp() error instead of waiting for regexec() to pick it up.
+
 
 Version 10.20 30-June-2015
 --------------------------

src/pcre2posix.c

@@ -231,6 +231,13 @@ if (preg->re_pcre2_code == NULL)
 preg->re_nsub = (size_t)re_nsub;
 if ((options & PCRE2_NO_AUTO_CAPTURE) != 0) re_nsub = -1;
 preg->re_match_data = pcre2_match_data_create(re_nsub + 1, NULL);
+
+if (preg->re_match_data == NULL)
+  {
+  pcre2_code_free(preg->re_pcre2_code);
+  return REG_ESPACE;
+  }
+
 return 0;
 }
 

src/pcre2test.c

@@ -4597,6 +4597,9 @@ if ((pat_patctl.control & CTL_POSIX) != 0)
     {
     size_t bsize, usize;
 
+    preg.re_pcre2_code = NULL;     /* In case something was left in there */
+    preg.re_match_data = NULL;
+
     bsize = (pat_patctl.regerror_buffsize != 0)?
       pat_patctl.regerror_buffsize : pbuffer8_size;
     if (bsize + 8 < pbuffer8_size)