[lldb] Remove redundant condition in watch mask check (NFC) (#94842)

This issue is reported by cppcheck as a pointless test in the watch mask
check. The `else if` condition is opposite to the previous `if`
condition, making the expression always true.

Caught by cppcheck -

lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm.cpp:509:25:
style: Expression is always true because 'else if' condition is opposite
to previous condition at line 505. [multiCondition]

Fix #91223

Author: xgupta

lldb/source/Plugins/Process/Linux/NativeRegisterContextLinux_arm.cpp

@@ -506,7 +506,7 @@ uint32_t NativeRegisterContextLinux_arm::SetHardwareWatchpoint(
       return LLDB_INVALID_INDEX32;
     else if (watch_mask <= 0x02)
       size = 2;
-    else if (watch_mask <= 0x04)
+    else
       size = 4;
 
     addr = addr & (~0x03);