target/arc: fix build with clang

Commit da41bce3ae ("target/arc: introduce breakpoint
functionality") introduces a mismatch between the format string
and one int constant.

Change the format string to match the int constant.

Change-Id: I0d59552205551b90e165c0a2e3fef247ad0c7701
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
Fixes: da41bce3ae ("target/arc: introduce breakpoint functionality")
Reviewed-on: http://openocd.zylin.com/5655
Tested-by: jenkins
Reviewed-by: Evgeniy Didin <didin@synopsys.com>
Reviewed-by: Tarek BOCHKATI <tarek.bouchkati@gmail.com>

src/target/arc.c

@@ -1445,7 +1445,7 @@ static int arc_unset_breakpoint(struct target *target,
 			} else {
 				LOG_WARNING("Software breakpoint @0x%" TARGET_PRIxADDR
 					" has been overwritten outside of debugger. "
-					"Expected: 0x%04" PRIx16 ", got: 0x%04" PRIx16,
+					"Expected: 0x%04x, got: 0x%04" PRIx16,
 					breakpoint->address, ARC_SDBBP_16, current_instr);
 			}
 		} else {