*: use fopen helpers where appropriate

function                                             old     new   delta
finalize                                             348     343      -5
parse_resolvconf                                     306     299      -7
list_i2c_busses_and_exit                             495     483     -12
bootchartd_main                                     1091    1076     -15
------------------------------------------------------------------------------
(add/remove: 0/0 grow/shrink: 0/4 up/down: 0/-39)             Total: -39 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

init/bootchartd.c

@@ -218,10 +218,10 @@ static char *make_tempdir(void)
 
 static void do_logging(unsigned sample_period_us, int process_accounting)
 {
-	FILE *proc_stat = xfopen("proc_stat.log", "w");
-	FILE *proc_diskstats = xfopen("proc_diskstats.log", "w");
-	//FILE *proc_netdev = xfopen("proc_netdev.log", "w");
-	FILE *proc_ps = xfopen("proc_ps.log", "w");
+	FILE *proc_stat = xfopen_for_write("proc_stat.log");
+	FILE *proc_diskstats = xfopen_for_write("proc_diskstats.log");
+	//FILE *proc_netdev = xfopen_for_write("proc_netdev.log");
+	FILE *proc_ps = xfopen_for_write("proc_ps.log");
 	int look_for_login_process = (getppid() == 1);
 	unsigned count = 60*1000*1000 / sample_period_us; /* ~1 minute */
 
@@ -268,7 +268,7 @@ static void finalize(char *tempdir, const char *prog, int process_accounting)
 	//local pacct=
 	//[ -e kernel_pacct ] && pacct=kernel_pacct
 
-	FILE *header_fp = xfopen("header", "w");
+	FILE *header_fp = xfopen_for_write("header");
 
 	if (process_accounting)
 		acct(NULL);

miscutils/i2c_tools.c

@@ -1149,12 +1149,12 @@ static void NORETURN list_i2c_busses_and_exit(void)
 		/* Simple version for ISA chips. */
 		snprintf(path, NAME_MAX, "%s/%s/name",
 			 i2cdev_path, de->d_name);
-		fp = fopen(path, "r");
+		fp = fopen_for_read(path);
 		if (fp == NULL) {
 			snprintf(path, NAME_MAX,
 				 "%s/%s/device/name",
 				 i2cdev_path, de->d_name);
-			fp = fopen(path, "r");
+			fp = fopen_for_read(path);
 		}
 
 		/* Non-ISA chips require the hard-way. */
@@ -1175,7 +1175,7 @@ static void NORETURN list_i2c_busses_and_exit(void)
 						 "%s/%s/device/%s/name",
 						 i2cdev_path, de->d_name,
 						 subde->d_name);
-					fp = fopen(path, "r");
+					fp = fopen_for_read(path);
 					break;
 				}
 			}

networking/nslookup.c

@@ -697,7 +697,7 @@ static void parse_resolvconf(void)
 {
 	FILE *resolv;
 
-	resolv = fopen("/etc/resolv.conf", "r");
+	resolv = fopen_for_read("/etc/resolv.conf");
 	if (resolv) {
 		char line[512];	/* "search" is defined to be up to 256 chars */