fix spelling in tcg sub directory

Signed-off-by: NDong Xu Wang <wdongxu@linux.vnet.ibm.com>
Signed-off-by: NStefan Hajnoczi <stefanha@linux.vnet.ibm.com>

tcg/tcg.c

@@ -1555,7 +1555,7 @@ static void temp_save(TCGContext *s, int temp, TCGRegSet allocated_regs)
     }
 }
 
-/* save globals to their cannonical location and assume they can be
+/* save globals to their canonical location and assume they can be
    modified be the following code. 'allocated_regs' is used in case a
    temporary registers needs to be allocated to store a constant. */
 static void save_globals(TCGContext *s, TCGRegSet allocated_regs)

tcg/tcg.h

@@ -178,7 +178,7 @@ typedef tcg_target_ulong TCGArg;
 /* Define a type and accessor macros for variables.  Using a struct is
    nice because it gives some level of type safely.  Ideally the compiler
    be able to see through all this.  However in practice this is not true,
-   expecially on targets with braindamaged ABIs (e.g. i386).
+   especially on targets with braindamaged ABIs (e.g. i386).
    We use plain int by default to avoid this runtime overhead.
    Users of tcg_gen_* don't need to know about any of this, and should
    treat TCGv as an opaque type.