ntdll: Fix returning from various ARM assembler functions.

dlls/ntdll/signal_arm.c

@@ -283,7 +283,7 @@ __ASM_STDCALL_FUNC( RtlCaptureContext, 4,
                     "str PC, [r0, #0x40]\n\t"  /* context->Pc */
                     "mrs r1, CPSR\n\t"
                     "str r1, [r0, #0x44]\n\t"  /* context->Cpsr */
-                    "mov PC, LR\n"
+                    "bx lr"
                     )
 
 
@@ -920,7 +920,7 @@ void signal_free_thread( TEB *teb )
 extern void set_tpidrurw( TEB *teb );
 __ASM_GLOBAL_FUNC( set_tpidrurw,
                    "mcr p15, 0, r0, c13, c0, 2\n\t" /* TEB -> TPIDRURW */
-                   "blx lr" )
+                   "bx lr" )
 #else
 void set_tpidrurw( TEB *teb )
 {