minor changes on strace for memory allocating

[Bai Weidong]

hello:
    I am afraid that strace may need minor changes on strace 
allocating memory failed. Could you please review patch? 
Thank you very much.

Signed-off-by: "Bai Weidong" <baiwd at cn.fujitsu.com>

Best Regards

--- strace-4.5.15/straceold.c	2007-09-24 11:05:43.000000000 +0800
+++ strace-4.5.15/strace.c	2007-09-24 17:18:18.000000000 +0800
@@ -335,7 +335,17 @@ char *argv[];
 	/* Allocate the initial tcbtab.  */
 	tcbtabsize = argc;	/* Surely enough for all -p args.  */
 	tcbtab = (struct tcb **) malloc (tcbtabsize * sizeof tcbtab[0]);
+	if (tcbtab == NULL) {
+		fprintf(stderr, "%s: out of memory\n",
+			progname);
+		exit(1);
+	}
 	tcbtab[0] = (struct tcb *) calloc (tcbtabsize, sizeof *tcbtab[0]);
+	if (tcbtab[0] == NULL) {
+		fprintf(stderr, "%s: out of memory\n",
+			progname);
+		exit(1);
+	}
 	for (tcp = tcbtab[0]; tcp < &tcbtab[0][tcbtabsize]; ++tcp)
 		tcbtab[tcp - tcbtab[0]] = &tcbtab[0][tcp - tcbtab[0]];