Correct end of stack in linker

Author: BennehBoy

Diff for: variants/BLUEPILL_F103C8/ldscript.ld

@@ -5,7 +5,7 @@
 **  File        : ldscript.ld
 **
 **  Abstract    : Linker script for STM32F103C(8-B)Tx Device with
-**                64/128KByte FLASH, 20KByte RAM
+**                32/64/128KByte FLASH, 10/20KByte RAM
 **
 **                Set heap size, stack size and stack location according
 **                to application requirements.
@@ -52,7 +52,7 @@
 ENTRY(Reset_Handler)
 
 /* Highest address of the user mode stack */
-_estack = 0x20005000;    /* end of RAM */
+_estack = 0x20000000 + LD_MAX_DATA_SIZE;    /* end of RAM */
 /* Generate a link error if heap and stack don't fit into RAM */
 _Min_Heap_Size = 0x200;      /* required amount of heap  */
 _Min_Stack_Size = 0x400; /* required amount of stack */