Remove xalloc.h dependency from parse-duration

[Bruce Korb]

xalloc.h drags in too much stuff:

diff --git a/lib/parse-duration.c b/lib/parse-duration.c
index 8c28133..7c8bdec 100644
--- a/lib/parse-duration.c
+++ b/lib/parse-duration.c
@@ -26,7 +26,6 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
-#include "xalloc.h"

 #ifndef NUL
 #define NUL '\0'
@@ -406,13 +405,17 @@ trim (char * pz)
 static time_t
 parse_period (cch_t * in_pz)
 {
-  char * pz   = xstrdup (in_pz);
-  char * pT   = strchr (pz, 'T');
+  char * pz   = strdup (in_pz);
+  char * pT;
   char * ps;
   void * fptr = pz;
   time_t res  = 0;

-  if (pT != NUL)
+  if (pz == NULL)
+    return BAD_TIME;
+
+  pT = strchr (pz, 'T');
+  if (pT != NULL)
     {
       *(pT++) = NUL;
       pz = trim (pz);
diff --git a/modules/parse-duration b/modules/parse-duration
index 2e8f3d1..e36c917 100644
--- a/modules/parse-duration
+++ b/modules/parse-duration
@@ -6,7 +6,6 @@ lib/parse-duration.h
 lib/parse-duration.c

 Depends-on:
-xalloc

 configure.ac:
 AC_REQUIRE([AC_C_INLINE])