Fix compilation warnings (apart from nanostack)

Author: michalpasztamobica

components/802.15.4_RF/stm-s2lp-rf-driver/source/rf_configuration.c

@@ -104,7 +104,7 @@ void rf_conf_calculate_rx_filter_bandwidth_registers(uint32_t rx_bandwidth, uint
     uint8_t chflt_e_tmp = 0;
     uint8_t chflt_m_tmp = 0;
 
-    while (rx_bandwidth < 900000 / (2 << chflt_e_tmp)) {
+    while (rx_bandwidth < 900000u / (2 << chflt_e_tmp)) {
         chflt_e_tmp++;
     }
     uint32_t rx_bandwidth_tmp = rx_bandwidth;

components/storage/blockdevice/COMPONENT_SD/SDBlockDevice.cpp

@@ -789,7 +789,7 @@ int SDBlockDevice::_cmd(SDBlockDevice::cmdSupported cmd, uint32_t arg, bool isAc
     switch (cmd) {
         case CMD8_SEND_IF_COND:             // Response R7
             debug_if(_dbg, "V2-Version Card\n");
-            _card_type = SDCARD_V2;
+            _card_type = SDCARD_V2; // fallthrough
         // Note: No break here, need to read rest of the response
         case CMD58_READ_OCR:                // Response R3
             response  = (_spi.write(SPI_FILL_CHAR) << 24);

features/cellular/framework/AT/ATHandler.cpp

@@ -467,7 +467,7 @@ ssize_t ATHandler::read_string(char *buf, size_t size, bool read_even_stop_tag)
         return -1;
     }
 
-    int len = 0;
+    unsigned int len = 0;
     size_t match_pos = 0;
     bool delimiter_found = false;
 

features/nanostack/mbed-mesh-api/source/wisun_tasklet.c

@@ -27,6 +27,7 @@
 #include "multicast_api.h"
 #include "mac_api.h"
 #include "sw_mac.h"
+#include "ws_management_api.h" //ws_management_node_init
 
 // For tracing we need to define flag, have include and define group
 //#define HAVE_DEBUG

platform/mbed_board.c

@@ -58,7 +58,7 @@ void mbed_error_vprintf(const char *format, va_list arg)
 {
     char buffer[132];
     int size = vsnprintf(buffer, sizeof buffer, format, arg);
-    if (size >= sizeof buffer) {
+    if ((unsigned int)size >= sizeof buffer) {
         /* Output was truncated - indicate by overwriting tail of buffer
          * with ellipsis, newline and null terminator.
          */