Fix typos in comments (neccessary -> necessary)

Signed-off-by: Stefan Weil <weil@mail.berlios.de>
Signed-off-by: Stefan Hajnoczi <stefanha@linux.vnet.ibm.com>

bsd-user/qemu.h

@@ -323,7 +323,7 @@ abi_long copy_from_user(void *hptr, abi_ulong gaddr, size_t len);
 abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len);
 
 /* Functions for accessing guest memory.  The tget and tput functions
-   read/write single values, byteswapping as neccessary.  The lock_user
+   read/write single values, byteswapping as necessary.  The lock_user
    gets a pointer to a contiguous area of guest memory, but does not perform
    and byteswapping.  lock_user may return either a pointer to the guest
    memory, or a temporary buffer.  */

linux-user/qemu.h

@@ -379,7 +379,7 @@ abi_long copy_from_user(void *hptr, abi_ulong gaddr, size_t len);
 abi_long copy_to_user(abi_ulong gaddr, void *hptr, size_t len);
 
 /* Functions for accessing guest memory.  The tget and tput functions
-   read/write single values, byteswapping as neccessary.  The lock_user
+   read/write single values, byteswapping as necessary.  The lock_user
    gets a pointer to a contiguous area of guest memory, but does not perform
    and byteswapping.  lock_user may return either a pointer to the guest
    memory, or a temporary buffer.  */

target-arm/translate.c

@@ -7348,7 +7348,7 @@ static void disas_arm_insn(CPUState * env, DisasContext *s)
                     } else if ((insn & 0x000003e0) == 0x00000060) {
                         tmp = load_reg(s, rm);
                         shift = (insn >> 10) & 3;
-                        /* ??? In many cases it's not neccessary to do a
+                        /* ??? In many cases it's not necessary to do a
                            rotate, a shift is sufficient.  */
                         if (shift != 0)
                             tcg_gen_rotri_i32(tmp, tmp, shift * 8);
@@ -8139,7 +8139,7 @@ static int disas_thumb2_insn(CPUState *env, DisasContext *s, uint16_t insn_hw1)
         case 1: /* Sign/zero extend.  */
             tmp = load_reg(s, rm);
             shift = (insn >> 4) & 3;
-            /* ??? In many cases it's not neccessary to do a
+            /* ??? In many cases it's not necessary to do a
                rotate, a shift is sufficient.  */
             if (shift != 0)
                 tcg_gen_rotri_i32(tmp, tmp, shift * 8);