Fix parsing arguments

When executing the 'ih' or 'it' command with multiple leading spaces,
the parsed arguments contained unexpected characters.

The problem stemmed from 'parse_args' allocating memory for 'buf' using
'malloc_or_fail', which does not initialize memory. Since 'strlen'
determines string length based on the first null terminator
it encounters, uninitialized memory beyond the expected input could be
incorrectly read, leading to unintended characters in 'argv'.

To fix this, an explicit null terminator was added at the end of
the parsing loop, ensuring proper null termination and
preventing 'strlen' from reading beyond valid input.

This change guarantees correct argument parsing
even when the input contains multiple leading spaces.

Close #233

Change-Id: I178fa357962b28fd22646ab9c21542e1c780bd55

Author: jouae

console.c

@@ -144,6 +144,8 @@ static char **parse_args(char *line, int *argcp)
             *dst++ = c;
         }
     }
+    /* Let the last substring is null-terminated */
+    *dst++ = '\0';
 
     /* Now assemble into array of strings */
     char **argv = calloc_or_fail(argc, sizeof(char *), "parse_args");