[usb-moded] Normalize use of sizeof operator

As 'sizeof' is not a function, do not make it look like one.

Also 'sizeof(char)' is redundant as it is 1 by definition.
Signed-off-by: Simo Piiroinen <simo.piiroinen@jollamobile.com>

src/usb_moded-config.c

@@ -340,7 +340,7 @@ static char * config_get_kcmdline_string(const char *entry)
         return(ret);
     }
 
-    len = read(fd, cmdLine, sizeof(cmdLine) - 1);
+    len = read(fd, cmdLine, sizeof cmdLine - 1);
     close(fd);
 
     if (len <= 0)

src/usb_moded-mac.c

@@ -105,7 +105,7 @@ char * mac_read_mac(void)
         fclose(g_ether);
         return 0;
     }
-    mac = malloc(sizeof(char) *17);
+    mac = malloc(17);
     if(mac)
         read = fread(mac, 1, 17, g_ether);
     if(read == 17)

src/usb_moded-network.c

@@ -344,8 +344,8 @@ end:
 static int network_checklink(void)
 {
     int ret = -1;
-    char dest[sizeof(UDHCP_CONFIG_PATH)+1];
-    size_t len = readlink(UDHCP_CONFIG_LINK, dest, sizeof(dest)-1);
+    char dest[sizeof UDHCP_CONFIG_PATH + 1];
+    size_t len = readlink(UDHCP_CONFIG_LINK, dest, sizeof dest - 1);
 
     if (len > 0)
     {
@@ -384,8 +384,8 @@ static int network_write_udhcpd_conf(ipforward_data_t *ipforward, mode_list_elem
     }
     /* generate start and end ip based on the setting */
     ip = config_get_network_setting(NETWORK_IP_KEY);
-    ipstart = malloc(sizeof(char)*15);
-    ipend = malloc(sizeof(char)*15);
+    ipstart = malloc(15);
+    ipend = malloc(15);
     while(i < 15)
     {
         if(dot < 3)