Some fixes

Author: mateoconlechuga

CEdev/lib/src/std/atoi.asm

@@ -11,7 +11,7 @@ _atoi:
 	push	bc
 	ld	bc,10
 	push	bc
-	ld	c,0
+	ld	c,b
 	push	bc
 	push	de
 	call	_strtol

CEdev/lib/src/std/bshrs.asm

@@ -16,7 +16,7 @@
 	.assume adl=1
 
 __bshrs:
-        ld	a,b
+        push	bc
         inc	b
         jr      test
 
@@ -25,5 +25,5 @@ loop:
 test:
        	djnz	loop
 
-	ld	b,a
+	pop	bc
 	ret

CEdev/lib/src/std/calloc.asm

@@ -17,14 +17,16 @@ _calloc:
 	add	hl,de 
 	or	a,a 
 	sbc	hl,de
+	pop	bc
 	ex	de,hl
-	pop	hl
 	ret	z
-	push	hl
+	push	bc
 	or	a,a
 	sbc	hl,hl
 	push	hl
 	push	de
 	call	_memset
 	pop	hl
+	pop	bc
+	pop	bc
 	ret