Fix -Werror-stringop error on infcmd.c:construct_inferior_arguments

While testing a GCC 10 build of our git HEAD, Sergio noticed an error
triggered by -Werror-stringop on
infcmd.c:construct_inferior_arguments.  One of the things the function
does is calculate the length of the string that will hold the
inferior's arguments.  GCC warns us that 'length' can be 0, which can
lead to undesired behaviour:

../../gdb/infcmd.c: In function 'char* construct_inferior_arguments(int, char**)':
../../gdb/infcmd.c:369:17: error: writing 1 byte into a region of size 0 [-Werror=stringop-overflow=]
  369 |       result[0] = '\0';
      |       ~~~~~~~~~~^~~~~~
../../gdb/infcmd.c:368:33: note: at offset 0 to an object with size 0 allocated by 'xmalloc' here
  368 |       result = (char *) xmalloc (length);
      |                         ~~~~~~~~^~~~~~~~

The solution here is to assert that 'argc' is greater than 0 on entry,
which makes GCC understand that the loops always run at least once,
and thus 'length' is always > 0.

Tested by rebuilding.

gdb/ChangeLog:
2020-01-29  Pedro Alves  <palves@redhat.com>
	    Sergio Durigan Junior  <sergiodj@redhat.com>

	* infcmd.c (construct_inferior_arguments): Assert that
	'argc' is greater than 0.

Change-Id: Ide8407cbedcb4921de1843a6a15bbcb7676c7d26

gdb/ChangeLog

@@ -1,3 +1,9 @@
+2020-01-29  Pedro Alves  <palves@redhat.com>
+	    Sergio Durigan Junior  <sergiodj@redhat.com>
+
+	* infcmd.c (construct_inferior_arguments): Assert that
+	'argc' is greater than 0.
+
 2020-01-29  Luis Machado  <luis.machado@linaro.org>
 
 	* aarch64-tdep.c (BRK_INSN_MASK): Define to 0xffe0001f.

gdb/infcmd.c

@@ -268,6 +268,11 @@ construct_inferior_arguments (int argc, char **argv)
 {
   char *result;
 
+  /* ARGC should always be at least 1, but we double check this
+     here.  This is also needed to silence -Werror-stringop
+     warnings.  */
+  gdb_assert (argc > 0);
+
   if (startup_with_shell)
     {
 #ifdef __MINGW32__