Ferocion: fix corruption of r0 when resuming Thumb mode

The wrong variable (pc instead of r0) was used.  Furthermore, someone
did cover this error by stupidly silencing the compiler warning that
occurred before a dummy void reference to r0 was added to the code.

Signed-off-by: David Brownell <dbrownell@users.sourceforge.net>

src/target/feroceon.c

@@ -335,7 +335,6 @@ void feroceon_branch_resume_thumb(target_t *target)
 	arm_jtag_t *jtag_info = &arm7_9->jtag_info;
 	uint32_t r0 = buf_get_u32(armv4_5->core_cache->reg_list[0].value, 0, 32);
 	uint32_t pc = buf_get_u32(armv4_5->core_cache->reg_list[15].value, 0, 32);
-	(void)(r0); // use R0...
 
 	arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
 	arm9tdmi_clock_out(jtag_info, ARMV4_5_NOP, 0, NULL, 0);
@@ -351,7 +350,7 @@ void feroceon_branch_resume_thumb(target_t *target)
 	arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 	arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 
-	arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, pc, NULL, 0);
+	arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, r0, NULL, 0);
 	arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);
 	arm9tdmi_clock_out(jtag_info, ARMV4_5_T_NOP, 0, NULL, 0);